Reland of gpu_test: enable Pixel_OffscreenCanvasUnaccelerated2DGPUCompositing

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 12 matching lines @@
 
     self.Fail('Pixel_ScissorTestWithPreserveDrawingBuffer',
         ['android'], bug=521588)
 
     # TODO(ccameron) fix these on Mac Retina
     self.Fail('Pixel_CSS3DBlueBox', ['mac'], bug=533690)
 
     # TODO(vmiura) check / generate reference images for Android devices
     self.Fail('Pixel_SolidColorBackground', ['mac', 'android'], bug=624256)
 
-    self.Fail('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositing', bug=615325)
     self.Fail('Pixel_OffscreenCanvasUnaccelerated2DGPUCompositingWorker',
-              bug=615325)
+              ['mac', ('nvidia', 0xfe9)], bug=652931)
 
     # TODO(kbr): flakily timing out on this configuration.
     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(zakerinasab): Check / generate reference images. Remove the Fail
     # lines after fixing 657946 and comment out the Skip line.
     self.Fail('Pixel_CanvasDisplayLinearRGBAccelerated2D', bug=657946)
     self.Fail('Pixel_CanvasDisplayLinearRGBUnaccelerated2D', bug=657946)
     self.Fail('Pixel_CanvasDisplayLinearRGBUnaccelerated2DGPUCompositing', bug=657946)