Re-enable pixel video tests.

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):
@@ skipping 32 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)
 
     self.Flaky('Pixel_OffscreenCanvas2DResizeOnWorker',
         ['win10', ('intel', 0x1912)], bug=690663)
 
-    # TODO(jbauman): Enable when reference images exist.
-    self.Fail('Pixel_Video_MP4', bug=704389)
-    self.Fail('Pixel_Video_VP9', bug=704389)
+    # TODO(jbauman): Times out on Linux NVIDIA.
+    self.Fail('Pixel_Video_VP9', ['linux', 'nvidia'], bug=704389)
+    # TODO(jbauman): Times out on Pixel C.
+    self.Fail('Pixel_Video_VP9', ['android', 'nvidia'], bug=704389)
 
     # TODO(xlai): Remove this after test dimension is shrunk
     # Intended to skip only Nexus 5
     self.Skip('Pixel_OffscreenCanvasAccelerated2D',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
     self.Skip('Pixel_OffscreenCanvasAccelerated2DWorker',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositing',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
     self.Skip('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositingWorker',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
     self.Skip('Pixel_OffscreenCanvasWebGLDefault',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
     self.Skip('Pixel_OffscreenCanvasWebGLDefaultWorker',
         ['android', ('qualcomm', 'Adreno (TM) 330')], bug=706647)
 
     # TODO(jbauman): Remove once windows 10 reference images are generated.
     self.Fail('*', ['win10'], bug=704389)