Add more documentation on testing infrastructure.

README.md

@@ -81,4 +81,5 @@ View the [Dev setup instructions](doc/DevSetup.md).
 * Watch a [short presentation](https://youtu.be/QrIKdjmpmaA) on the Vulkan back-end.
 * Track the [dEQP test conformance](doc/dEQP-Charts.md)
 * Read design docs on the [Vulkan back-end](src/libANGLE/renderer/vulkan/README.md)
+* Read about ANGLE's [testing infrastructure](infra/README.md)
 * If you use ANGLE in your own project, we'd love to hear about it!

doc/ContributingCode.md

@@ -64,6 +64,8 @@
    * We do not currently have the capability to run individual bots or tests in a run.
 * Tests can also be run locally, ANGLE's main testing methods are:
    * `angle_unittests`, `angle_end2end_tests` and `angle_white_box_tests` targets.
+   * The OpenGL CTS also known as [drawElements Quality Program (dEQP)](dEQP.md).
+     If you're working on a new feature, there may be some extensive tests for it already written.
    * The [Top-of-Tree WebGL Conformance tests][WebGL-CTS].
      * If you are a Chromium developer, see
        [Building ANGLE for Chromium Development][build-ANGLE-for-chromium] for instructions on
@@ -84,8 +86,6 @@
     ANGLE patches that have been committed.  There may be hardware configurations that are not
     tested by the ANGLE trybots, if you notice breakage on this waterfall after landing a patch,
     please notify a project member.
-  * ANGLE also includes the [drawElements Quality Program (dEQP)](dEQP.md) for additional testing.
-    If you're working on a new feature, there may be some extensive tests for it already written.
 
 [WebGL-CTS]: https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html
 [build-ANGLE-for-Chromium]: BuildingAngleForChromiumDevelopment.md

infra/ANGLEWrangling.md

@@ -13,7 +13,12 @@ As an ANGLE Sheriff. Your job is to:
 If you're not an ANGLE team member, you can contact us on the public ANGLE project
 [Google group](https://groups.google.com/forum/#!forum/angleproject).
 
-## Task 1: The Try Waterfall
+**Note**: It's highly recommend that all wranglers install the [Chromium Flake Linker][Flaker]
+extension for inspecting bot builds. It'll save you a lot of time.
+
+[Flaker]: https://chrome.google.com/webstore/detail/flake-linker/boamnmbgmfnobomddmenbaicodgglkhc
+
+## Task 1: Montitor ANGLE CI and Try Testers
 
 Your first job is to keep the
 [ANGLE Try Waterfall](https://ci.chromium.org/p/chromium/g/angle.try/builders) healthy.  Some

infra/README.md

-# ANGLE Standalone Testing Infrastructure
+# ANGLE Testing Infrastructure
+
+ANGLE runs hundreds of thousands of tests on every change before it lands in
+the tree. We scale our pre-commit and post-commit testing to many machines
+using [Chromium Swarming][Swarming]. Our testing setup heavily leverages
+existing work in Chromium. We also run compile-only
+[Standalone Testing][Standalone] that does not depend on a Chromium checkout.
+
+Also see the documentation on [ANGLE Wrangling][Wrangling] for more info.
+
+## Pre-Commit Testing
+
+See the pre-commit try waterfall here:
+
+[`https://ci.chromium.org/p/chromium/g/angle.try/builders`](https://ci.chromium.org/p/chromium/g/angle.try/builders)
+
+We currently run pre-commit tests on:
+
+ * Windows 32-bit AMD and Windows 64-bit Intel and NVIDIA GPUs
+ * Linux 64-bit NVIDIA and Intel GPUs
+ * Mac NVIDIA, Intel and AMD GPUs
+ * Pixel 2 and Nexus 5X
+ * Fuchsia testing in a VM
+
+Looking at an example build shows how tests are split up between machines. See for example:
+
+[`https://ci.chromium.org/p/chromium/builders/try/mac-angle-rel/5905`](https://ci.chromium.org/p/chromium/builders/try/mac-angle-rel/5905)
+
+This build ran 82 test steps across 3 GPU families. In some cases (e.g.
+webgl2_conformance_tests) the test is split up between multiple machines to
+run faster (in this case 20 different machines at once). This build took 27
+minutes to complete multiple hours of real automated testing.
+
+For more details on running and working with our test sets see the docs in [Contributing Code][Contrib].
+
+[Swarming]: https://chromium-swarm.appspot.com/
+[Standalone]: #ANGLE-Standalone-Testing
+[Contrib]: ../doc/ContributingCode.md#Testing
+[Wrangling]: ANGLEWrangling.md
+
+## ANGLE Standalone Testing
 
 In addition to the ANGLE try bots using Chrome, and the GPU.FYI bots, ANGLE
 has standalone testing on the Chrome infrastructure. Currently these tests are