Improve gpu pixel tests for OffscreenCanvas 2d

content/test/gpu/gpu_tests/pixel_expectations.py

Index: content/test/gpu/gpu_tests/pixel_expectations.py
diff --git a/content/test/gpu/gpu_tests/pixel_expectations.py b/content/test/gpu/gpu_tests/pixel_expectations.py
index bceb253427c4af9dc5829fc371654d491528fb71..f9ac8ace5f8e18a2d07c1b6cfd414fb92785b73a 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -44,3 +44,11 @@ class PixelExpectations(GpuTestExpectations):
 
     # TODO(kbr): flakily timing out on this configuration.
     self.Flaky('*', ['linux', 'intel', 'debug'], bug=648369)
+
+    # TODO(xlai): check / generate reference images.
+    self.Fail('Pixel_OffscreenCanvasAccelerated2D', bug=655311)
+    self.Fail('Pixel_OffscreenCanvasAccelerated2DWorker', bug=655311)
+    self.Fail('Pixel_OffscreenCanvasUnaccelerated2D', bug=655311)
+    self.Fail('Pixel_OffscreenCanvasUnaccelerated2DWorker', bug=655311)
+    self.Fail('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositing', bug=655311)
+    self.Fail('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositingWorker', bug=655311)