gpu: Skip media stream pixel test on ChromeOS

This pixel test relies on using a raw YUV file in the Chromium checkout
for the fake video capture device.  This doesn't work when the test runs
on another device than the test harness like for Android and ChromeOS.

TBR=zmo@chromium.org,behdadb@chromium.org

Bug: 1129879
Change-Id: Iaf0d410d7a83ea06c9add4696ee4ad7de8794d3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419334Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808501}

content/test/gpu/gpu_tests/test_expectations/pixel_expectations.txt

@@ -390,5 +390,7 @@ crbug.com/1086690 [ chromeos ] Pixel_WebGLSadCanvas [ Skip ]
 # Likely produces a Dawn validation errors that makes rendering skipped.
 crbug.com/1097735 [ use-skia-dawn ] Pixel_PaintWorkletTransform [ Failure ]
 
-# Cannot use a file in source directory on host for fake video capture device on Android
-crbug.com/1077211 [ android no-use-skia-dawn ] Pixel_Video_Media_Stream_Incompatible_Stride [ Skip ]
+# Cannot use file in Chromium checkout for fake video capture device on Android
+# or ChromeOS.
+crbug.com/1129879 [ android no-use-skia-dawn ] Pixel_Video_Media_Stream_Incompatible_Stride [ Skip ]
+crbug.com/1129879 [ chromeos no-use-skia-dawn ] Pixel_Video_Media_Stream_Incompatible_Stride [ Skip ]

content/test/gpu/gpu_tests/test_expectations/trace_test_expectations.txt

@@ -131,5 +131,7 @@ crbug.com/1058255 [ fuchsia ] TraceTest_WebGLGreenTriangle_AA_Alpha [ Skip ]
 [ fuchsia ] DeviceTraceTest_Canvas2DTabSwitch_SoftwareCompositing [ Skip ]
 [ fuchsia ] DeviceTraceTest_WebGLReadPixelsTabSwitch_SoftwareCompositing [ Skip ]
 
-# Cannot use a file in Chromium checkout for fake video capture device on Android
-crbug.com/1077211 [ android ] TraceTest_Video_Media_Stream_Incompatible_Stride [ Skip ]
+# Cannot use file in Chromium checkout for fake video capture device on Android
+# or ChromeOS.
+crbug.com/1129879 [ android ] TraceTest_Video_Media_Stream_Incompatible_Stride [ Skip ]
+crbug.com/1129879 [ chromeos ] TraceTest_Video_Media_Stream_Incompatible_Stride [ Skip ]