Use srcset's resource pixel density to determine intrinsic size

Source/core/rendering/RenderReplaced.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  *
  */
 
 #include "config.h"
 #include "core/rendering/RenderReplaced.h"
 
 #include "RuntimeEnabledFeatures.h"
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/rendering/LayoutRepainter.h"
 #include "core/rendering/RenderBlock.h"
+#include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 
 using namespace std;
 
 namespace WebCore {
 
 const int cDefaultWidth = 300;
 const int cDefaultHeight = 150;
 
@@ skipping 229 matching lines @@
 
 void RenderReplaced::computeAspectRatioInformationForRenderBox(RenderBox* contentRenderer, FloatSize& constrainedSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
 {
     FloatSize intrinsicSize;
     if (contentRenderer) {
         contentRenderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
         if (intrinsicRatio)
             ASSERT(!isPercentageIntrinsicSize);
 
         // Handle zoom & vertical writing modes here, as the embedded document doesn't know about them.
-        if (!isPercentageIntrinsicSize)
+        if (!isPercentageIntrinsicSize) {
             intrinsicSize.scale(style()->effectiveZoom());
+            if (isRenderImage())
+                intrinsicSize.scale(toRenderImage(this)->imageDevicePixelRatio());
+        }
 
         if (rendererHasAspectRatio(this) && isPercentageIntrinsicSize)
             intrinsicRatio = 1;
 
         // Update our intrinsic size to match what the content renderer has computed, so that when we
         // constrain the size below, the correct intrinsic size will be obtained for comparison against
         // min and max widths.
         if (intrinsicRatio && !isPercentageIntrinsicSize && !intrinsicSize.isEmpty())
             m_intrinsicSize = LayoutSize(intrinsicSize);
 
@@ skipping 329 matching lines @@
 
     if (style()) {
         if (v)
             r.inflate(style()->outlineSize());
     }
     computeRectForRepaint(repaintContainer, r);
     return r;
 }
 
 }