Add suppression for GPU Pixel test in preparation for Skia CL

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 757260a1d3372c036989a7d38859ca100f25bbf8..a8b06ccdd4f972f5feb1cf32cebebf9ff05934fc 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -12,6 +12,8 @@ class PixelExpectations(GpuTestExpectations):
     # self.Fail('Pixel_Canvas2DRedBox',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
 
+    self.Fail('Pixel_CSSFilterEffects', bug=672527)

[f(malita), 2016/12/08 17:23:41]

I'm not familiar with gpu pixel tests -- is Fail the right expectation here? 
Immediately after this lands, the test will still pass, so maybe we should use
Flaky or Skip instead?  I guess we'll see if the bots complain.

You'll also need a content/ owner to approve this, so I'm deferring to them.

+
     # Software compositing is not supported on Android; so we skip these tests
     # that disables gpu compositing on Android platforms.
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2D', ['android'])