Reland: Make 2D canvas disable gpu acceleration when getImageData is called

third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/RecordingImageBufferSurface.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/ImageBufferClient.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
@@ skipping 20 matching lines @@
         : m_isDirty(false)
         , m_imageBuffer(imageBuffer)
         , m_frameCount(0)
     { }
 
     ~FakeImageBufferClient() override { }
 
     // ImageBufferClient implementation
     void notifySurfaceInvalid() override { }
     bool isDirty() override { return m_isDirty; }
+    void didDisableAcceleration() override { }
     void didFinalizeFrame() override
     {
         if (m_isDirty) {
             Platform::current()->currentThread()->removeTaskObserver(this);
             m_isDirty = false;
         }
         ++m_frameCount;
     }
 
     // TaskObserver implementation
@@ skipping 333 matching lines @@
     expectDisplayListEnabled(true);
 }
 
 TEST_F(RecordingImageBufferSurfaceTest, testClearRect)
 {
     CALL_TEST_TASK_WRAPPER(testClearRect);
     expectDisplayListEnabled(true);
 }
 
 } // namespace blink