Suppress canvas-teximage-after-multiple-drawimages flake.

The test's JavaScript execution races with document parsing. Mark
flaky until the test is fixed and rolled forward.

Bug: 905682
Change-Id: I6602bd31bc7ad60ce848571126eaa47be34a804c
Tbr: rjkroege@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1338619Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608604}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -97,6 +97,12 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         'gl-bindAttribLocation-aliasing-inactive.html',
         ['no_angle'], bug=829541)
 
+    # Newly introduced flaky failure.
+    # TODO(kbr): re-enable after fixing test.
+    self.Flaky('conformance/textures/misc/' +
+               'canvas-teximage-after-multiple-drawimages.html',
+               bug=905682)
+
     # This test needs to be rewritten to measure its expected
     # performance; it's currently too flaky even on release bots.
     self.Skip('conformance/rendering/texture-switch-performance.html',

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

@@ -124,6 +124,12 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         'in-parameter-passed-as-inout-argument-and-global.html',
         ['nvidia'], bug=792210)
 
+    # Newly introduced flaky failure.
+    # TODO(kbr): re-enable after fixing test.
+    self.Flaky('conformance/textures/misc/' +
+               'canvas-teximage-after-multiple-drawimages.html',
+               bug=905682)
+
     # This test needs to be rewritten to measure its expected
     # performance; it's currently too flaky even on release bots.
     self.Skip('conformance/rendering/texture-switch-performance.html',