Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/core/platform/DragImage.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 145 matching lines @@
             imageSize.setWidth(kMaxDragLabelWidth);
             clipURLString = true;
         } else
             imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + kDragLabelBorderX * 2);
     }
 
     // We now know how big the image needs to be, so we create and
     // fill the background
     IntSize scaledImageSize = imageSize;
     scaledImageSize.scale(deviceScaleFactor);
-    OwnPtr<ImageBuffer> buffer(ImageBuffer::create(scaledImageSize, deviceScaleFactor));
+    OwnPtr<ImageBuffer> buffer(ImageBuffer::create(scaledImageSize));
     if (!buffer)
         return nullptr;
+    buffer->context()->scale(FloatSize(deviceScaleFactor, deviceScaleFactor));
 
     const float DragLabelRadius = 5;
     const IntSize radii(DragLabelRadius, DragLabelRadius);
     IntRect rect(IntPoint(), imageSize);
     const Color backgroundColor(140, 140, 140);
     buffer->context()->fillRoundedRect(rect, radii, radii, radii, radii, backgroundColor);
 
     // Draw the text
     if (drawURLString) {
         if (clipURLString)
@@ skipping 78 matching lines @@
             *pixel = SkPreMultiplyARGB(
                 SkColorGetA(*pixel) * fraction,
                 SkColorGetR(*pixel),
                 SkColorGetG(*pixel),
                 SkColorGetB(*pixel));
         }
     }
 }
 
 } // namespace WebCore