Add additional suppression for Pixel_WebGLSadCanvas

Bug: 75305
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Iaed1d7d2a5d70245bd38b5fd044428b4ee795ad5
TBR: kbr@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1048310Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556824}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -100,4 +100,5 @@ class PixelExpectations(GpuTestExpectations):
 
     # TODO(kbr): temporary suppression for new test.
     self.Flaky('Pixel_WebGLSadCanvas', ['mac'], bug=575305)
+    self.Flaky('Pixel_WebGLSadCanvas', ['win', 'intel'], bug=575305)
     self.Fail('Pixel_WebGLSadCanvas', ['android', 'nvidia'], bug=575305)