Web setting for canvas2d msaa

Source/core/platform/graphics/ImageBuffer.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 67 matching lines @@
 
 enum OpacityMode {
     NonOpaque,
     Opaque,
 };
 
 class ImageBuffer {
     WTF_MAKE_NONCOPYABLE(ImageBuffer); WTF_MAKE_FAST_ALLOCATED;
 public:
     // Will return a null pointer on allocation failure.
-    static PassOwnPtr<ImageBuffer> create(const IntSize& size, float resolutionScale = 1, RenderingMode renderingMode = Unaccelerated, OpacityMode opacityMode = NonOpaque)
+    static PassOwnPtr<ImageBuffer> create(const IntSize& size, float resolutionScale = 1, RenderingMode renderingMode = Unaccelerated, OpacityMode opacityMode = NonOpaque, int acceleratedMSAASampleCount = 0)
     {
         bool success = false;
-        OwnPtr<ImageBuffer> buf = adoptPtr(new ImageBuffer(size, resolutionScale, renderingMode, opacityMode, success));
+        OwnPtr<ImageBuffer> buf = adoptPtr(new ImageBuffer(size, resolutionScale, renderingMode, opacityMode, acceleratedMSAASampleCount, success));
         if (!success)
             return nullptr;
         return buf.release();
     }
 
     static PassOwnPtr<ImageBuffer> createCompatibleBuffer(const IntSize&, float resolutionScale, const GraphicsContext*, bool hasAlpha);
 
     ~ImageBuffer();
 
     // The actual resolution of the backing store
@@ skipping 39 matching lines @@
 
     IntSize m_size;
     IntSize m_logicalSize;
     float m_resolutionScale;
     RefPtr<SkCanvas> m_canvas;
     OwnPtr<GraphicsContext> m_context;
     Canvas2DLayerBridgePtr m_layerBridge;
 
     // This constructor will place its success into the given out-variable
     // so that create() knows when it should return failure.
-    ImageBuffer(const IntSize&, float resolutionScale, RenderingMode, OpacityMode, bool& success);
+    ImageBuffer(const IntSize&, float resolutionScale, RenderingMode, OpacityMode, int acceleratedSampleCount, bool& success);
     ImageBuffer(const IntSize&, float resolutionScale, const GraphicsContext*, bool hasAlpha, bool& success);
 };
 
 String ImageDataToDataURL(const ImageData&, const String& mimeType, const double* quality);
 
 } // namespace WebCore
 
 #endif // ImageBuffer_h