Add video pixel tests for DirectComposition layers.

The --enable-direct-composition-layers flag will force chrome to use
DirectComposition layers for hardware-decoded video (assuming
DirectComposition is actually supported on the system).

BUG=704389
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2805173002
Cr-Commit-Position: refs/heads/master@{#463008}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -55,6 +55,9 @@ class PixelExpectations(GpuTestExpectations):
     # TODO(jbauman): Times out on Pixel C.
     self.Fail('Pixel_Video_VP9', ['android', 'nvidia'], bug=704389)
 
+    # TODO(jbauman): Re-enable when references images created.
+    self.Fail('Pixel_DirectComposition_Video_*', ['win'], bug=704389)
+
     # TODO(xlai): Remove this after test dimension is shrunk
     # Intended to skip only Nexus 5
     self.Skip('Pixel_OffscreenCanvasAccelerated2D',

content/test/gpu/gpu_tests/pixel_integration_test.py

@@ -122,6 +122,8 @@ class PixelIntegrationTest(
     pages += pixel_test_pages.ExperimentalCanvasFeaturesPages(name)
     if sys.platform.startswith('darwin'):
       pages += pixel_test_pages.MacSpecificPages(name)
+    if sys.platform.startswith('win'):
+      pages += pixel_test_pages.DirectCompositionPages(name)
     for p in pages:
       yield(p.name, gpu_relative_path + p.url, (p))
 

content/test/gpu/gpu_tests/pixel_test_pages.py

@@ -487,3 +487,21 @@ def MacSpecificPages(base_name):
       tolerance=10,
       browser_args=['--disable-mac-overlays']),
   ]
+
+def DirectCompositionPages(base_name):
+  browser_args = ['--enable-direct-composition-layers']
+  return [
+    PixelTestPage(
+      'pixel_video_mp4.html',
+      base_name + '_DirectComposition_Video_MP4',
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      browser_args=browser_args),
+
+    PixelTestPage(
+      'pixel_video_vp9.html',
+      base_name + '_DirectComposition_Video_VP9',
+      test_rect=[0, 0, 300, 300],
+      revision=1,
+      browser_args=browser_args),
+  ]