Implement WebGL's commit with software compositing

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 2f15bfb4fe9101d4cb2d12787c8f6178acced4e4..9dafb75826d3c258cd42aea773552f55816701a5 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -16,6 +16,9 @@ class PixelExpectations(GpuTestExpectations):
     # that disables gpu compositing on Android platforms.
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2D', ['android'])
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2DWorker', ['android'])
+    self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositing', ['android'])
+    self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker',
+              ['android'])
 
     self.Fail('Pixel_ScissorTestWithPreserveDrawingBuffer',
         ['android'], bug=521588)
@@ -38,6 +41,8 @@ class PixelExpectations(GpuTestExpectations):
 
     self.Fail('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositingWorker',
               ['mac', ('nvidia', 0xfe9)], bug=652931)
+    self.Fail('Pixel_OffscreenCanvasWebGLSoftwareCompositing', bug=563852)
+    self.Fail('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker', bug=563858)
 
     # TODO(kbr): flakily timing out on this configuration.
     self.Flaky('*', ['linux', 'intel', 'debug'], bug=648369)