Suppress pixel tests

Several pixel tests started failing. The cause is unclear and guess
culprit CLs do not cleanly revert. It is better to skip the tests for
now while we can investigate.

TBR=kbr@chromium.org

Bug: 1102086
Change-Id: Ib64ec3c68dab713629100226e1eab5628763df65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283242Reviewed-by: Chris Blume <cblume@chromium.org>
Commit-Queue: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785392}

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

@@ -158,7 +158,8 @@ crbug.com/927901 [ mac ] Pixel_Video_VP9_DXVA [ Skip ]
 crbug.com/927901 [ chromeos ] Pixel_Video_VP9_DXVA [ Skip ]
 
 # Complex overlays test is flaky on Nvidia probably due to its small size.
-crbug.com/929425 [ win nvidia no-use-skia-dawn ] Pixel_DirectComposition_ComplexOverlays [ RetryOnFailure ]
+# TODO(cblume): Commented out until a more broad suppression can be reverted / fixed.
+# crbug.com/929425 [ win nvidia no-use-skia-dawn ] Pixel_DirectComposition_ComplexOverlays [ RetryOnFailure ]
 
 # Mark all webview tests as RetryOnFailure due to Nexus 5x driver bug.
 crbug.com/950932 [ android-webview-instrumentation qualcomm-adreno-(tm)-418 ] * [ RetryOnFailure ]
@@ -336,3 +337,14 @@ 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 ]
+
+# TODO(cblume): temporarily suppress these test until reverted / fixed.
+crbug.com/1102086 [ win nvidia no-use-skia-dawn ] Pixel_DirectComposition_ComplexOverlays [ Skip ]
+crbug.com/1102086 [ win7 amd no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4_FourColors_Aspect_4x3 [ Skip ]
+crbug.com/1102086 [ mac intel ] Pixel_Video_Context_Loss_MP4 [ Skip ]
+crbug.com/1102086 [ mac intel no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4 [ Skip ]
+crbug.com/1102086 [ mac intel no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4_FourColors_Aspect_4x3 [ Skip ]
+crbug.com/1102086 [ mac intel no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_180 [ Skip ]
+crbug.com/1102086 [ mac intel no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_270 [ Skip ]
+crbug.com/1102086 [ mac intel no-use-skia-dawn no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_90 [ Skip ]
+crbug.com/1102086 [ mac intel ] Pixel_Video_MP4_Rounded_Corner [ Skip ]