The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a30107e85221e2ce1afcfc58d7c9941c26b6ab5e

commit a30107e85221e2ce1afcfc58d7c9941c26b6ab5e
Author: Yuly Novikov <ynovikov@chromium.org>
Date: Thu Dec 06 20:03:57 2018

Suppress Flaky WebGL and WebGL2 failures

Android Nvidia:
conformance/glsl/constructors/glsl-construct-mat2.html

Win Intel OpenGL Passthrough:
conformance2/rendering/out-of-bounds-index-buffers-after-copying.html

Mac Nvidia:
conformance2/glsl3/compound-assignment-type-combination.html
conformance2/query/occlusion-query.html
conformance2/state/gl-object-get-calls.html
conformance2/textures/canvas_sub_rectangle/tex-2d-r8-red-unsigned_byte.html
conformance2/textures/canvas_sub_rectangle/tex-2d-rgb5_a1-rgba-unsigned_short_5_5_5_1.html
conformance2/textures/canvas_sub_rectangle/tex-2d-rgb16f-rgb-half_float.html'
conformance2/textures/canvas_sub_rectangle/tex-2d-rgb565-rgb-unsigned_short_5_6_5.html
conformance2/textures/canvas/tex-3d-r16f-red-half_float.html

TBR=kbr@chromium.org

Bug: 911772, 912579,  912583 
Change-Id: I5ff7c6521d998502f5716ca014878e0aa07a30c8
Reviewed-on: https://chromium-review.googlesource.com/c/1366022
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614462}
[modify] https://crrev.com/a30107e85221e2ce1afcfc58d7c9941c26b6ab5e/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
[modify] https://crrev.com/a30107e85221e2ce1afcfc58d7c9941c26b6ab5e/content/test/gpu/gpu_tests/webgl_conformance_expectations.py

Also flaky on Nexus 5X.
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Android%20FYI%20Release%20%28Nexus%205X%29/12102
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Android%20FYI%20Release%20%28Nexus%205X%29/12103
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Android%20FYI%20Release%20%28Nexus%205X%29/12111

Merging this into issue 912161