Fix display list canvas not rendering correctly on high dpi displays

Source/platform/graphics/ImageBuffer.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 247 matching lines @@
 
     return result;
 }
 
 void ImageBuffer::draw(GraphicsContext* context, const FloatRect& destRect, const FloatRect* srcPtr, CompositeOperator op, WebBlendMode blendMode)
 {
     if (!isSurfaceValid())
         return;
 
     FloatRect srcRect = srcPtr ? *srcPtr : FloatRect(FloatPoint(), size());
-    RefPtr<SkPicture> picture = m_surface->getPicture();
-    if (picture) {
-        context->drawPicture(picture.get(), destRect, srcRect, op, blendMode);
-        return;
-    }
-
-    SkBitmap bitmap = m_surface->bitmap();
-    // For ImageBufferSurface that enables cachedBitmap, Use the cached Bitmap for CPU side usage
-    // if it is available, otherwise generate and use it.
-    if (!context->isAccelerated() && m_surface->isAccelerated() && m_surface->cachedBitmapEnabled() && isSurfaceValid()) {
-        m_surface->updateCachedBitmapIfNeeded();
-        bitmap = m_surface->cachedBitmap();
-    }
-
-    RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(drawNeedsCopy(m_context.get(), context) ? deepSkBitmapCopy(bitmap) : bitmap));
-
-    context->drawImage(image.get(), destRect, srcRect, op, blendMode, DoNotRespectImageOrientation);
+    m_surface->draw(context, destRect, srcRect, op, blendMode, drawNeedsCopy(m_context.get(), context));
 }
 
 void ImageBuffer::flush()
 {
     if (m_surface->canvas()) {
         m_surface->canvas()->flush();
     }
 }
 
 void ImageBuffer::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const FloatSize& scale,
@@ skipping 115 matching lines @@
 
 String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
 {
     if (!isSurfaceValid())
         return "data:,";
 
     return ImageEncoder::toDataURL(m_surface->bitmap(), mimeType, quality);
 }
 
 } // namespace blink