Fixed Shadow blur for transparent objects

Source/platform/graphics/skia/NativeImageSkia.cpp

 /*
  * Copyright (c) 2008, 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 146 matching lines @@
 void NativeImageSkia::draw(
     GraphicsContext* context,
     const SkRect& srcRect,
     const SkRect& destRect,
     CompositeOperator compositeOp,
     WebBlendMode blendMode) const
 {
     TRACE_EVENT0("skia", "NativeImageSkia::draw");
 
     bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap());
+    bool isOpaque = bitmap().isOpaque();
 
     SkPaint paint;
-    context->preparePaintForDrawRectToRect(&paint, srcRect, destRect, compositeOp, blendMode, isLazyDecoded, isDataComplete());
+    context->preparePaintForDrawRectToRect(&paint, srcRect, destRect, compositeOp, blendMode, !isOpaque, isLazyDecoded, isDataComplete());
     // We want to filter it if we decided to do interpolation above, or if
     // there is something interesting going on with the matrix (like a rotation).
     // Note: for serialization, we will want to subset the bitmap first so we
     // don't send extra pixels.
     context->drawBitmapRect(bitmap(), &srcRect, destRect, &paint);
 
     if (isLazyDecoded)
         PlatformInstrumentation::didDrawLazyPixelRef(bitmap().getGenerationID());
     context->didDrawRect(destRect, paint, &bitmap());
 }
@@ skipping 189 matching lines @@
 SkIRect NativeImageSkia::ImageResourceInfo::rectInSubset(const SkIRect& otherScaledImageSubset)
 {
     if (!scaledImageSubset.contains(otherScaledImageSubset))
         return SkIRect::MakeEmpty();
     SkIRect subsetRect = otherScaledImageSubset;
     subsetRect.offset(-scaledImageSubset.x(), -scaledImageSubset.y());
     return subsetRect;
 }
 
 } // namespace blink