Use viewBox for SVG image as intrinsic size when all else fails

Source/core/layout/LayoutReplaced.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 208 matching lines @@
 
 LayoutRect LayoutReplaced::replacedContentRect(const LayoutSize* overriddenIntrinsicSize) const
 {
     LayoutRect contentRect = contentBoxRect();
     ObjectFit objectFit = style()->objectFit();
 
     if (objectFit == ObjectFitFill && style()->objectPosition() == ComputedStyle::initialObjectPosition()) {
         return contentRect;
     }
 
+    // TODO(davve): intrinsicSize doubles as both intrinsic size and intrinsic ratio. In the case of
+    // SVG images this isn't correct since they can have intrinsic ratio but no intrinsic size. In
+    // order to maintain aspect ratio, the intrinsic size for SVG might be faked from the aspect
+    // ratio, see SVGImage::containerSize().
     LayoutSize intrinsicSize = overriddenIntrinsicSize ? *overriddenIntrinsicSize : this->intrinsicSize();
     if (!intrinsicSize.width() || !intrinsicSize.height())
         return contentRect;
 
     LayoutRect finalRect = contentRect;
     switch (objectFit) {
     case ObjectFitContain:
     case ObjectFitScaleDown:
     case ObjectFitCover:
         finalRect.setSize(finalRect.size().fitToAspectRatio(intrinsicSize, objectFit == ObjectFitCover ? AspectRatioFitGrow : AspectRatioFitShrink));
@@ skipping 266 matching lines @@
         return LayoutRect();
 
     // The selectionRect can project outside of the overflowRect, so take their union
     // for paint invalidation to avoid selection painting glitches.
     LayoutRect r = isSelected() ? localSelectionRect() : visualOverflowRect();
     mapRectToPaintInvalidationBacking(paintInvalidationContainer, r, paintInvalidationState);
     return r;
 }
 
 }