Fix failing transferToImageBitmap layout tests and commit pixel test on Mac

third_party/WebKit/Source/platform/graphics/gpu/DrawingBufferTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 494 matching lines @@
         bool wantAntialiasing = false;
         RefPtr<DrawingBuffer> drawingBuffer = DrawingBuffer::create(
             std::move(provider),
             IntSize(10, 10),
             premultipliedAlpha,
             wantAlphaChannel,
             wantDepthBuffer,
             wantStencilBuffer,
             wantAntialiasing,
             preserve,
-            DrawingBuffer::WebGL1);
+            DrawingBuffer::WebGL1,
+            DrawingBuffer::AllowChromiumImage);
 
         // When we request a depth or a stencil buffer, we will get both.
         EXPECT_EQ(cases[i].requestDepth || cases[i].requestStencil, drawingBuffer->hasDepthBuffer());
         EXPECT_EQ(cases[i].requestDepth || cases[i].requestStencil, drawingBuffer->hasStencilBuffer());
         EXPECT_EQ(cases[i].expectedRenderBuffers, trackingGL->numAllocatedRenderBuffer());
         if (cases[i].requestDepth || cases[i].requestStencil) {
             EXPECT_NE(0u, trackingGL->depthStencilAttachment());
             EXPECT_EQ(0u, trackingGL->depthAttachment());
             EXPECT_EQ(0u, trackingGL->stencilAttachment());
         } else {
@@ skipping 34 matching lines @@
     m_drawingBuffer->setIsHidden(true);
     releaseCallback->Run(waitSyncToken, false /* lostResource */);
     // m_drawingBuffer deletes mailbox immediately when hidden.
 
     EXPECT_EQ(waitSyncToken, m_gl->mostRecentlyWaitedSyncToken());
 
     m_drawingBuffer->beginDestruction();
 }
 
 } // namespace blink