Fix performance regression in WebGL to 2D canvas draws.

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // Copyright 2016 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/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 119 matching lines @@
         return nullptr;
     sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(PreferAcceleration, SnapshotReasonTransferToImageBitmap);
     DCHECK(isMainThread() || !skImage->isTextureBacked()); // Acceleration not yet supported in Workers
     RefPtr<StaticBitmapImage> image = StaticBitmapImage::create(std::move(skImage));
     image->setOriginClean(this->originClean());
     m_imageBuffer.reset(); // "Transfer" means no retained buffer
     m_needsMatrixClipRestore = true;
     return ImageBitmap::create(image.release());
 }
 
-PassRefPtr<Image> OffscreenCanvasRenderingContext2D::getImage(SnapshotReason reason) const
+PassRefPtr<Image> OffscreenCanvasRenderingContext2D::getImage(AccelerationHint hint, SnapshotReason reason) const
 {
     if (!imageBuffer())
         return nullptr;
-    sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(PreferAcceleration, reason);
+    sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(hint, reason);
     RefPtr<StaticBitmapImage> image = StaticBitmapImage::create(std::move(skImage));
     return image;
 }
 
 void OffscreenCanvasRenderingContext2D::setOffscreenCanvasGetContextResult(OffscreenRenderingContext& result)
 {
     result.setOffscreenCanvasRenderingContext2D(this);
 }
 
 bool OffscreenCanvasRenderingContext2D::parseColorOrCurrentColor(Color& color, const String& colorString) const
@@ skipping 56 matching lines @@
 bool OffscreenCanvasRenderingContext2D::isContextLost() const
 {
     return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const
 {
     return this->imageBuffer();
 }
 }