Fix display list canvas not rendering correctly on high dpi displays

Source/platform/graphics/ImageBufferSurface.cpp

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "platform/graphics/ImageBufferSurface.h"
 
+#include "platform/graphics/BitmapImage.h"
+#include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkDevice.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace blink {
 
 ImageBufferSurface::ImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
     : m_opacityMode(opacityMode)
@@ skipping 34 matching lines @@
 {
     DEFINE_STATIC_LOCAL(SkBitmap, nullBitmap, ());
     return nullBitmap;
 }
 
 PassRefPtr<SkImage> ImageBufferSurface::newImageSnapshot() const
 {
     return nullptr;
 }
 
+static SkBitmap deepSkBitmapCopy(const SkBitmap& bitmap)
+{
+    SkBitmap tmp;
+    if (!bitmap.deepCopyTo(&tmp))
+        bitmap.copyTo(&tmp, bitmap.colorType());
+
+    return tmp;
+}
+
+void ImageBufferSurface::draw(GraphicsContext* context, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator op, WebBlendMode blendMode, bool needsCopy)
+{
+    SkBitmap bmp = 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() && isAccelerated() && cachedBitmapEnabled() && isValid()) {
+        updateCachedBitmapIfNeeded();
+        bmp = cachedBitmap();
+    }
+
+    RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(needsCopy ? deepSkBitmapCopy(bmp) : bmp));
+
+    context->drawImage(image.get(), destRect, srcRect, op, blendMode, DoNotRespectImageOrientation);
+}
+
 } // namespace blink