[gpu_tests] Disable flaky pixel tests

content/test/gpu/gpu_tests/pixel_expectations.py

Index: content/test/gpu/gpu_tests/pixel_expectations.py
diff --git a/content/test/gpu/gpu_tests/pixel_expectations.py b/content/test/gpu/gpu_tests/pixel_expectations.py
index 757260a1d3372c036989a7d38859ca100f25bbf8..4c40cf79b273a579c9af453befe82e9040e4762b 100644
--- a/content/test/gpu/gpu_tests/pixel_expectations.py
+++ b/content/test/gpu/gpu_tests/pixel_expectations.py
@@ -44,3 +44,15 @@ class PixelExpectations(GpuTestExpectations):
     # TODO(kainino): remove this once golden images are generated
     self.Fail('Pixel_WebGLTransparentGreenTriangle_NoAlpha_ImplicitClear',
               bug=666259)
+
+    self.Fail('Pixel_CSSFilterEffects_NoOverlays', ['mac'], bug=672999)
+    self.Fail('Pixel_Canvas2DRedBox', ['mac'], bug=672999)
+    self.Fail('Pixel_CanvasDisplayLinearRGBAccelerated2D', ['mac'], bug=672999)
+    self.Fail('Pixel_CanvasDisplayLinearRGBUnaccelerated2D', ['mac'],
+              bug=672999)
+    self.Fail('Pixel_CanvasDisplayLinearRGBUnaccelerated2DGPUCompositing',
+              ['mac'], bug=672999)
+    self.Fail('Pixel_IOSurface2DCanvas', ['mac'], bug=672999)
+    self.Fail('Pixel_OffscreenCanvasTransferToImageBitmapWorker', ['mac'],
+              bug=672999)
+    self.Fail('Pixel_WebGLGreenTriangle_NoAA_NoAlpha', ['mac'], bug=672999)