This introduces an end2end test that makes the same GLES1
calls as Android's default boot animation. The test uses
images of much smaller sizes, but we do the same thing
with the images as the original code (it uses one image as a
mask and moves the other along behind it).

The original default boot animation code can be found here:
https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/cmds/bootanimation/BootAnimation.cpp#422

This change also implements glTexParameterx since the default boot
animation requires it. This function is part of OES_FIXED_POINT.

This also includes a test to check for int to floating point cast errors
when using GL_TEXTURE_CROP_RECT_OES.

Tests: angle_end2end_tests --gtest_filter=*DefaultBootAnimation*
       angle_end2end_tests
       --gtest_filter=*TextureParameterTest.IntConversionsAndIntBounds*
Bug: angleproject:3644
Change-Id: Ib7e99c9dc1c001c71543d03ea4dd76082192f6a7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2053506
Commit-Queue: Brandon Schade <b.schade@samsung.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tobin Ehlis <tobine@google.com>