SkImage-ify DragImage

Source/platform/DragImage.h

Index: Source/platform/DragImage.h
diff --git a/Source/platform/DragImage.h b/Source/platform/DragImage.h
index 8579e303ae526bc66676c13e1d37b3b51b993ec0..6c3acfa7ff33bb1cb15fbbbbb19f19f764e76c32 100644
--- a/Source/platform/DragImage.h
+++ b/Source/platform/DragImage.h
@@ -26,6 +26,7 @@
 #ifndef DragImage_h
 #define DragImage_h
 
+#include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/ImageOrientation.h"
@@ -41,17 +42,21 @@ class KURL;
 
 class PLATFORM_EXPORT DragImage {
 public:
-    static PassOwnPtr<DragImage> create(Image*, RespectImageOrientationEnum = DoNotRespectImageOrientation, float deviceScaleFactor = 1, InterpolationQuality = InterpolationHigh);
+    static PassOwnPtr<DragImage> create(Image*,
+        RespectImageOrientationEnum = DoNotRespectImageOrientation, float deviceScaleFactor = 1,
+        InterpolationQuality = InterpolationHigh, float opacity = 1,
+        const FloatSize& imageScale = FloatSize(1, 1));
+
     static PassOwnPtr<DragImage> create(const KURL&, const String& label, const FontDescription& systemFont, float deviceScaleFactor);
     ~DragImage();
 
+    static FloatSize clampedImageScale(const Image&, const IntSize&, const IntSize& maxSize);
+
     const SkBitmap& bitmap() { return m_bitmap; }
     float resolutionScale() const { return m_resolutionScale; }
     IntSize size() const { return IntSize(m_bitmap.width(), m_bitmap.height()); }
 
-    void fitToMaxSize(const IntSize& srcSize, const IntSize& maxSize);
     void scale(float scaleX, float scaleY);
-    void dissolveToFraction(float fraction);
 
 private:
     DragImage(const SkBitmap&, float resolutionScale, InterpolationQuality);