Avoid GPU readback in tex(Sub)Image2D(ImageBitmap)

third_party/WebKit/Source/platform/DragImageTest.cpp

 /*
  * Copyright (C) 2010 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 50 matching lines @@
         return adoptRef(new TestImage(size));
     }
 
     IntSize size() const override
     {
         ASSERT(m_image);
 
         return IntSize(m_image->width(), m_image->height());
     }
 
-    PassRefPtr<SkImage> imageForCurrentFrame() override
+    PassRefPtr<SkImage> imageForCurrentFrame(WebGraphicsContext3DProvider* = nullptr) override
     {
         return m_image;
     }
 
     bool currentFrameKnownToBeOpaque(MetadataMode = UseCurrentMetadata) override
     {
         return false;
     }
 
     void destroyDecodedData() override
@@ skipping 147 matching lines @@
     {
         SkAutoLockPixels lock1(dragBitmap);
         SkAutoLockPixels lock2(expectedBitmap);
         for (int x = 0; x < dragBitmap.width(); ++x)
             for (int y = 0; y < dragBitmap.height(); ++y)
                 EXPECT_EQ(expectedBitmap.getColor(x, y), dragBitmap.getColor(x, y));
     }
 }
 
 } // namespace blink