Prevent image downscaling on HiDPI devices with impl-side painting.

Source/WebCore/platform/graphics/skia/ImageSkia.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 345 matching lines @@
 {
     TRACE_EVENT0("skia", "paintSkBitmap");
     SkPaint paint;
     paint.setXfermodeMode(compOp);
     paint.setAlpha(platformContext->getNormalizedAlpha());
     paint.setLooper(platformContext->getDrawLooper());
     // only antialias if we're rotated or skewed
     paint.setAntiAlias(hasNon90rotation(platformContext));
 
     ResamplingMode resampling;
-    if (platformContext->isAccelerated())
+    if (platformContext->isAccelerated() || platformContext->isDeferred())
         resampling = RESAMPLE_LINEAR;
     else if (platformContext->printing())
         resampling = RESAMPLE_NONE;
     else {
         // Take into account scale applied to the canvas when computing sampling mode (e.g. CSS scale or page scale).
         SkRect destRectTarget = destRect;
         if (!(platformContext->getTotalMatrix().getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)))
             platformContext->getTotalMatrix().mapRect(&destRectTarget, destRect);
 
         resampling = computeResamplingMode(platformContext->getTotalMatrix(), bitmap,
@@ skipping 275 matching lines @@
         *bm,
         normSrcRect,
         normDstRect,
         WebCoreCompositeToSkiaComposite(compositeOp));
 
     if (ImageObserver* observer = imageObserver())
         observer->didDraw(this);
 }
 
 } // namespace WebCore