Fixed Shadow blur for transparent objects

Source/platform/graphics/StaticBitmapImage.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/StaticBitmapImage.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/skia/NativeImageSkia.h"
@@ skipping 31 matching lines @@
     FloatRect normSrcRect = adjustForNegativeSize(srcRect);
 
     normSrcRect.intersect(FloatRect(0, 0, m_image->width(), m_image->height()));
 
     if (normSrcRect.isEmpty() || normDstRect.isEmpty())
         return; // Nothing to draw.
 
     ASSERT(normSrcRect.width() <= m_image->width() && normSrcRect.height() <= m_image->height());
 
     SkPaint paint;
-    ctx->preparePaintForDrawRectToRect(&paint, srcRect, dstRect, compositeOp, blendMode);
+    ctx->preparePaintForDrawRectToRect(&paint, srcRect, dstRect, compositeOp, blendMode, !currentFrameKnownToBeOpaque());
 
     SkRect srcSkRect = WebCoreFloatRectToSKRect(normSrcRect);
     SkRect dstSkRect = WebCoreFloatRectToSKRect(normDstRect);
 
     SkCanvas* canvas = ctx->canvas();
 
     canvas->drawImageRect(m_image.get(), &srcSkRect, dstSkRect, &paint);
 
     if (ImageObserver* observer = imageObserver())
         observer->didDraw(this);
 }
 
 }