Rebaseline Pixel_Canvas*LowLatency2D tests, 1/2

crrev.com/c/1412856 disabled tests those two tests for Mac.
This CL does the first part of rebaselining those:
- Marks the pixel test as failing without platform condition
- Increases the revision in the pixel_test_pages.py

Bug: 922218
Change-Id: Ic27f6a04b1362df820f0abb648b9c23699aa0fc7
Reviewed-on: https://chromium-review.googlesource.com/c/1436081Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626130}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -27,7 +27,8 @@ class PixelExpectations(GpuTestExpectations):
     self.Skip('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker',
               ['android'])
     self.Skip('Pixel_CanvasDisplayLinearRGBUnaccelerated2D', ['android'])
-    self.Skip('Pixel_CanvasUnacceleratedLowLatency2D', ['android'])
+    # Disable temporarily to avoid a collision, https://crbug.com/922218
+    #self.Skip('Pixel_CanvasUnacceleratedLowLatency2D', ['android'])
     self.Skip('Pixel_RepeatedWebGLTo2D_SoftwareCompositing', ['android'])
 
     # Tests running with SwiftShader are skipped on platforms where SwiftShader
@@ -137,5 +138,5 @@ class PixelExpectations(GpuTestExpectations):
         ['mac', ('amd', 0x679e)], bug=911413)
 
     # TODO(mcasas): re-enable after rebaselining, https://crbug.com/922218
-    self.Fail('Pixel_CanvasLowLatency2D', ['mac'], bug=922218)
-    self.Fail('Pixel_CanvasUnacceleratedLowLatency2D', ['mac'], bug=922218)
+    self.Fail('Pixel_CanvasLowLatency2D', bug=922218)
+    self.Fail('Pixel_CanvasUnacceleratedLowLatency2D', bug=922218)

content/test/gpu/gpu_tests/pixel_test_pages.py

@@ -857,14 +857,14 @@ def ExperimentalCanvasFeaturesPages(base_name):
       'pixel_canvas_low_latency_2d.html',
       base_name + '_CanvasLowLatency2D',
       test_rect=[0, 0, 100, 100],
-      revision=5,
+      revision=6,
       browser_args=browser_args),
 
     PixelTestPage(
       'pixel_canvas_low_latency_2d.html',
       base_name + '_CanvasUnacceleratedLowLatency2D',
       test_rect=[0, 0, 100, 100],
-      revision=2,
+      revision=3,
       browser_args=browser_args + unaccelerated_args),
 
     PixelTestPage(