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

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.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 "modules/canvas2d/CanvasRenderingContext2D.h"
 
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/html/HTMLCanvasElement.h"
@@ skipping 29 matching lines @@
 
 class FakeImageSource : public CanvasImageSource {
 public:
     FakeImageSource(IntSize, BitmapOpacity);
 
     PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*, AccelerationHint, SnapshotReason, const FloatSize&) const override;
 
     bool wouldTaintOrigin(SecurityOrigin* destinationSecurityOrigin) const override { return false; }
     FloatSize elementSize(const FloatSize&) const override { return FloatSize(m_size); }
     bool isOpaque() const override { return m_isOpaque; }
+    int sourceWidth() override { return m_size.width(); }
+    int sourceHeight() override { return m_size.height(); }
 
     ~FakeImageSource() override { }
 
 private:
     IntSize m_size;
     RefPtr<Image> m_image;
     bool m_isOpaque;
 };
 
 FakeImageSource::FakeImageSource(IntSize size, BitmapOpacity opacity)
@@ skipping 723 matching lines @@
     EXPECT_FALSE(exceptionState.hadException());
     EXPECT_FALSE(bridge->isAccelerated());
     EXPECT_EQ(0u, getGlobalAcceleratedImageBufferCount());
     EXPECT_EQ(0, getGlobalGPUMemoryUsage());
 
     // Restore global state to prevent side-effects on other tests
     RuntimeEnabledFeatures::setCanvas2dFixedRenderingModeEnabled(savedFixedRenderingMode);
 }
 
 } // namespace blink