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 0f7c774dd65ed57d9928f2a76dbf66b3491baac2..8107cfcb6c4e3a8336a5b97c379afcc1885e259b 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -12,6 +12,10 @@ class PixelExpectations(GpuTestExpectations):
     # self.Fail('Pixel_Canvas2DRedBox',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
 
+    self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositing', ['android'])
+    self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker',
+              ['android'])
+
     self.Fail('Pixel_ScissorTestWithPreserveDrawingBuffer',
         ['android'], bug=521588)
 
@@ -36,6 +40,8 @@ class PixelExpectations(GpuTestExpectations):
     self.Fail('Pixel_OffscreenCanvasUnaccelerated2DWorker', bug=563858)
     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)