This is split off from a change to implement multisampled textures for
the Vulkan back-end, and will come before that change.  The changes
include:

- Make a common utility rx::GetSamplePosition() function.  D3D11 and
  Vulkan use the same standard sample positions/locations for 1, 2, 4,
  8, and 16 samples.  The D3D11 back-end has a utility function for
  this, which is being moved to a common location--for use by both the
  D3D11 and Vulkan back-ends.

- Texture::setStorageMultisample() handles converting the "requested number of
  samples" to the actual number of samples used (e.g. converting 3 to 4),
  supported by the underlying back-end).  The actual number used is stored in
  gl::TextureState::mImageDescs, for use by other GLES commands.

- Change some end2end tests to not make assumptions about the supported number
  of samples, but to properly query what is supported.

Bug: angleproject:3565
Bug: angleproject:4196
Change-Id: I1dc12fedd0f8fb4975f90d87486e443b069b7141
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1948535
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>

This flag is always true now and is being removed from GN.

Bug: angleproject:4026
Bug: angleproject:2344
Change-Id: I7e90d95a41cd4a9e054e3e102578db3323e999e8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1951525Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

Renaming "all" targets to reduce duplication. Also add libGLESv1_CM to
"angle". And remove "shader_translator" since we already had
"angle_shader_translator".

An attempt to work around "invalid COFF sections" error that is popping
up on the MSVC try bots.

Bug: None
Change-Id: I105aa5e59f67173643a3a2071b2aff345b5a6135
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947457Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

Bug: angleproject:3803
Change-Id: Ib260c86c68e5b11deaec8658cd9768af9b44e086
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1949629
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

There is a bug that prevents us from running these tests on the windows
bots.  This change enables them on other platforms so we don't lose
coverage.

Bug: angleproject:3738
Change-Id: I9b546c3223499af88b347f8a01be8edb245c19a7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950654
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

This could lead to a subtle bug:

Say we use a buffer as a storage buffer and write to it. We then must
issue a memory barrier before using it as a uniform buffer. However we
would set the SHADER_READ bit as a read mask on a storage buffer
access. This seems like it could lead to a missing barrier.

Bug: angleproject:4178
Change-Id: I486002739b7fb000ffacc0a1e996784b7875e7ba
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1943034
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>

Bug: 1023747
Change-Id: I8ca320432aad663e2a6d70f494692df518376258
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947710Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Shrek Shao <shrekshao@google.com>

The failures have been triaged and split into more specific bugs.

Bug: angleproject:3601
Change-Id: Icb262a047bba78a11d710e479ad659a9fa1caf1a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1948524
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>

Add tracking of shared memory declarations in compute shaders.

Test:
  angle_deqp_gles31_tests --gtest_filter=dEQP.GLES31/functional_debug_negative_coverage_callbacks_compute_exceed_shared_memory_size_limit

Bug: 4173
Change-Id: If2a86d467a82f73fa5b2ee0ced752701acfe1872
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1934653
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>

BUG=chromium:1028799
R=jonahr
CC=vasilyt

Change-Id: Id17c4061b206953b1e904bf7938cb371612e33fd
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1948534Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/Vulkan-ValidationLayers.git/+log/4fde9b750992..e72b61c7c20d

git log 4fde9b750992..e72b61c7c20d --date=short --first-parent --format='%ad %ae %s'
2019-12-03 dadschoorse@gmail.com include cassert in vk_extension_helper.h

Created with:
  gclient setdep -r third_party/vulkan-validation-layers/src@e72b61c7c20d

If this roll has caused a breakage, revert this CL and stop the roller
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Bug: None
Tbr: geofflang@google.com
Change-Id: I647c43e868f17775548545671e283830559b3aba
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950027Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://swiftshader.googlesource.com/SwiftShader.git/+log/b64fbfec4dcd..bbd0694f9ab2

git log b64fbfec4dcd..bbd0694f9ab2 --date=short --first-parent --format='%ad %ae %s'
2019-12-03 chrisforbes@google.com Remove Common/Types.hpp include from SpirvShader
2019-12-03 chrisforbes@google.com Regres: Add pending deqp change to fix bad graphicsfuzz tests
2019-12-03 srisser@google.com Make Vk::Stringify return std::string

Created with:
  gclient setdep -r third_party/SwiftShader@bbd0694f9ab2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Bug: None
Tbr: geofflang@google.com
Change-Id: Ia5795718520bc2de13a5331fb3471f5d16ba5dbe
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950025Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/3ed4586044f2..e82a428605f6


Created with:
  gclient setdep -r third_party/spirv-tools/src@e82a428605f6

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Bug: None
Tbr: geofflang@google.com
Change-Id: I84921c632e3a8f55a5c2e16d03984f5119d7ac15
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950024Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/a4af7676feb0..e58c080d4f02


Created with:
  gclient setdep -r third_party/glslang/src@e58c080d4f02

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Bug: None
Tbr: geofflang@google.com
Change-Id: Ia950c8adef32a30ee53f05e3c9e01d8576f62f8e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1950026Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

This is to support the upcoming `precise` keyword.

Bug: angleproject:3569
Change-Id: Idbcc8fd6f261757dbbf81b381e7a2dae938d8101
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947451Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

Bug: angleproject:3569
Change-Id: I7cbbaa4d1cdd4dd4268f28e06c907958cff9b4e8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947450
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

ANGLE translator's parser code generation is changed to use the binaries
of flex/bison stored in the cloud.  scripts/run_code_generation.py now
automatically runs these files if the input files change.

Bug: angleproject:3419
Change-Id: Icce4247f93b27baf8ee12dbb16112fa2cc98c111
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1940572Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

These transitions were incorrectly handled by an execution barrier
alone, but that's not per spec.  Write-after-write hazards always need a
memory barrier.

Bug: angleproject:3347
Bug: angleproject:3554
Change-Id: Id2d2579888e0b59e589fcdd52416363f2cf5cf97
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1943546Reviewed-by: Tobin Ehlis <tobine@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

This reverts commit fb40d231.

Reason for revert: Has a bug with the ASan build and also has a few
bugs with ANGLE standalone test expectations an filter.

Bug: chromium:1030192
Bug: angleproject:4193

Original change's description:
> Add new test runner harness.
> 
> The ANGLE test harness is a harness around GoogleTest that provides
> functionality similar to the Chromium test harness. It supports:
> 
>  * splitting a test set into shards
>  * catching and reporting crashes and timeouts
>  * outputting to the Chromium JSON test results format
>  * multi-process execution
> 
> Unit tests are added in test_utils_unittest.cpp.
> 
> Bug: angleproject:3162
> Change-Id: Idb15f113de8eb32db12bc93542de93b08d7c1447
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1478016
> Commit-Queue: Jamie Madill <jmadill@chromium.org>
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

TBR=ynovikov@chromium.org,jonahr@google.com,jmadill@chromium.org

Change-Id: I647e747571784b1ca7c1d0687193c70a63eb08d1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:3162
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947456Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

BUG=1029091

Change-Id: I552627dd18d0d5b48c02bff12c9368c724a65f54
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947448Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

BUG=angleproject:4185

Change-Id: I236d4372ab22e9083d00cf13fa2ad682a1d42f14
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947447Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

BUG=angleproject:1944

Change-Id: I3f6e50fbc93948416c32070418a4f24a51a3c1bd
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947452Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

The almost identical one in third_party/vulkan-loader/src/BUILD.gn
is used instead, and this one is unused.

Bug: None
Change-Id: I9d1acfdec019fb4bc74ed4869014edbf9fd64ca5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947449
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

Bug: angleproject:4186
Change-Id: I4fcfe2553f209e191d88058fe30d31c88a61f69f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947446Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

Disable returning BGRA as an implementation read format unless
GL_EXT_texture_format_BGRA8888 is exposed.  WebGL doesn't support this extension
and returning BGRA as an implementation read format is invalid.

TEST=functional/gles3/negativebufferapi.html
TEST=functional/gles3/integerstatequery.html

BUG=angleproject:4179

Change-Id: I313721f09da0e455128b88b129bd34338d47af73
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1943407Reviewed-by: James Darpinian <jdarpinian@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

We moved this into the SwiftShader repo proper in:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/38491

We can remove ANGLE's custom rules. Also removes the layer generation
script which was now unused. Also cleans up the Vulkan back-end
BUILD.gn a bit.

Bug: dawn:283
Change-Id: I490e8e8fc6fcadec58aca53a157ce7c4a47def3c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1932340Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/83af46951202..a4af7676feb0


Created with:
  gclient setdep -r third_party/glslang/src@a4af7676feb0

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Documentation for the AutoRoller is here:
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Bug: None
Tbr: geofflang@google.com
Change-Id: Iae5df5c516d75f2aa8aa1a738b627027a8a07f19
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947722Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/Vulkan-Tools.git/+log/979b531e9fff..0a0625a3dca6

git log 979b531e9fff..0a0625a3dca6 --date=short --first-parent --format='%ad %ae %s'
2019-12-02 bill.hollings@brenwill.com vkcube: Replace MoltenVK surfaces with Metal

Created with:
  gclient setdep -r third_party/vulkan-tools/src@0a0625a3dca6

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Bug: None
Tbr: geofflang@google.com
Change-Id: I6fef339859da970f0416ce0d8f6f874d3af8ac98
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947720Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/47f3eb42641b..3ed4586044f2


Created with:
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Change-Id: I43e63689ab019e69440bac9c2a92fffa7b87a838
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1947721Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

The ANGLE test harness is a harness around GoogleTest that provides
functionality similar to the Chromium test harness. It supports:

 * splitting a test set into shards
 * catching and reporting crashes and timeouts
 * outputting to the Chromium JSON test results format
 * multi-process execution

Unit tests are added in test_utils_unittest.cpp.

Bug: angleproject:3162
Change-Id: Idb15f113de8eb32db12bc93542de93b08d7c1447
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1478016
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

glWaitSemaphoreEXT and glSignalSemaphoreEXT functions optionally request
buffer and image barriers to be performed by the implementation.

If any barriers are present, a single global memory barrier is inserted
to take care of memory accesses.

In both functions, buffer and image memory barriers are used to perform
queue ownership transfers to ANGLE's queue (glWaitSemaphoreEXT) or the
EXTERNAL queue (glSignalSemaphoreEXT).

In glWaitSemaphoreEXT, the given layouts are information regarding how
the external entity (the caller) has modified the images' layouts, and
is used to update ANGLE's internal state tracking.

Bug: angleproject:3289
Bug: 1026673
Change-Id: Ic478a8813df727c89413c8ae2adf42b5c1d06069
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1933016
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>

MAX_DRAW_BUFFERS has a minimum value of 4.  This test was
unconditionally using 6 draw buffers.

Bug: angleproject:4092
Bug: angleproject:4180
Change-Id: I069874a6402da1cb007bf9504e68b9910951cf63
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1944527Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Alexis Hétu <sugoi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

The test does this:

1. Context 1: Read Texture 1 and draw into Framebuffer 1
2. Context 2: Read Texture 1 and draw into Framebuffer 2
3. Context 1: Delete Framebuffer 1
4. Context 1: Flush
5. Context 2: Modify Texture 1

Issue is Texture 1's mCurrentReadingNodes contains one node from each
context's command graph, one of which is deleted at step 4. At step 5, a
dependency is added from both nodes (one already deleted) to a new node,
causing use-after-free.

Bug: angleproject:4130
Change-Id: I06720aec20d0b49114937f1cd9b193a4f1df9d8d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1924790Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

BUG=1029091

Change-Id: I80a69f5d5294522d7229976f41ba5a61a6c2724d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1945891Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

Add the following SWANGLE test failure to
deqp_gles31_test_expectations.txt:

dEQP-GLES31.functional.debug.negative_coverage.get_error.buffer.framebuffer_texture2d

Bug: angleproject:3590
Test: None
Change-Id: I0f234ea2d7a90e2b95220b152cb0da3822df1ef3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1933764Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Tobin Ehlis <tobine@google.com>
Commit-Queue: Tim Van Patten <timvp@google.com>

The issue was fixed, but adding a regression test to avoid it
again. glMemoryBarrier inserts a memory barrier and breaks the
submission order, which causes the copyBufferToImage happens
before copyImageToBuffer and image corruption. This test fails
on commit 052167bc, and can pass on the latest build.

Bug: angleproject:4074
Change-Id: Icc42dd7b2ba167815b223085ce933682654ce760
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1943848
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>

https://swiftshader.googlesource.com/SwiftShader.git/+log/fb7ca1d5aca5..b64fbfec4dcd

git log fb7ca1d5aca5..b64fbfec4dcd --date=short --first-parent --format='%ad %ae %s'
2019-11-30 bclayton@google.com VkPipeline: Replace spirv-opt list with RegisterPerformancePasses()
2019-11-29 paulthomson@google.com Regres: refactor for use as a library
2019-11-29 swiftshader.regress@gmail.com Regres: Update test lists @ fb7ca1d5

Created with:
  gclient setdep -r third_party/SwiftShader@b64fbfec4dcd

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-angle-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: cwallez@google.com
Change-Id: Id3d9dfdb0769511da8391220411aac9726ebb6b2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1946094Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/b334829a91d6..47f3eb42641b


Created with:
  gclient setdep -r third_party/spirv-tools/src@47f3eb42641b

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/spirv-tools-angle-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: cwallez@google.com
Change-Id: I814d0cb3b82a5218140d785421b3c69d5fb8ebd3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1946095Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/38b4db48f98c..83af46951202


Created with:
  gclient setdep -r third_party/glslang/src@83af46951202

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/glslang-angle-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: cwallez@google.com
Change-Id: I4476e3fdea378cb843430a21d64d2f17e13983a2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1946096Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

SwiftShader recently added support for multisampled Bresenham lines to be spec
compliant with Vulkan, so now Angle must explicitly request non-Bresenham lines
when multisampling is enabled.

Bug: angleproject:4087
Change-Id: Ie854746144894e3e0a68622e985cbd4ba7781ac3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1944529
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>