Mark Pixel_CanvasLowLatency2D Fail instead of Skip.

Needed to generate new reference images.

Tbr: mcasas@chromium.org
Bug: 865957
Change-Id: I87e8f15550a7bddef25f2f7ce22d07184d13ea17
Reviewed-on: https://chromium-review.googlesource.com/c/1311842Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604476}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -46,7 +46,7 @@ class PixelExpectations(GpuTestExpectations):
         ['android'], bug=521588)
 
     # TODO(mcasas): Reenable after Android reference images are updated
-    self.Skip('Pixel_CanvasLowLatency2D', bug=865957)
+    self.Fail('Pixel_CanvasLowLatency2D', bug=865957)
 
     # TODO(vmiura) check / generate reference images for Android devices
     self.Fail('Pixel_SolidColorBackground', ['mac', 'android'], bug=624256)