Add suppression for GPU Pixel test in preparation for Skia CL

content/test/gpu/gpu_tests/pixel_expectations.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class PixelExpectations(GpuTestExpectations):
   def SetExpectations(self):
     # Sample Usage:
     # 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'])
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2DWorker', ['android'])
     self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositing', ['android'])
     self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker',
               ['android'])
     self.Skip('Pixel_CanvasDisplayLinearRGBUnaccelerated2D', ['android'])
 
     self.Fail('Pixel_ScissorTestWithPreserveDrawingBuffer',
@@ skipping 12 matching lines @@
     self.Flaky('*', ['linux', 'intel', 'debug'], bug=648369)
 
     # Flaky for unknown reasons only on macOS. Not planning to investigate
     # further.
     self.Flaky('Pixel_ScissorTestWithPreserveDrawingBuffer', ['mac'],
                bug=660461)
 
     # TODO(kainino): remove this once golden images are generated
     self.Fail('Pixel_WebGLTransparentGreenTriangle_NoAlpha_ImplicitClear',
               bug=666259)