Break dependency of platform/graphics on html/ImageData.h

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 32 matching lines @@
 #include "wtf/Uint8ClampedArray.h"
 #include "wtf/Vector.h"
 
 class SkCanvas;
 
 namespace WebKit { class WebLayer; }
 
 namespace WebCore {
 
 class Image;
-class ImageData;
 class IntPoint;
 class IntRect;
 class GraphicsContext3D;
 
 enum Multiply {
     Premultiplied,
     Unmultiplied
 };
 
 enum RenderingMode {
@@ skipping 81 matching lines @@
     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, 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);
+struct ImageDataBuffer {
+    ImageDataBuffer(const IntSize& size, PassRefPtr<Uint8ClampedArray> data) : m_size(size), m_data(data) { }
+    IntSize size() const { return m_size; }
+    unsigned char* data() const { return m_data->data(); }
+
+    IntSize m_size;
+    RefPtr<Uint8ClampedArray> m_data;
+};
+
+String ImageDataToDataURL(const ImageDataBuffer&, const String& mimeType, const double* quality);
 
 } // namespace WebCore
 
 #endif // ImageBuffer_h