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

Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 160 matching lines @@
     double intrinsicRatio = 0;
     renderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
 
     if (intrinsicSize.isEmpty() && intrinsicRatio) {
         if (!intrinsicSize.width() && intrinsicSize.height())
             intrinsicSize.setWidth(intrinsicSize.height() * intrinsicRatio);
         else if (intrinsicSize.width() && !intrinsicSize.height())
             intrinsicSize.setHeight(intrinsicSize.width() / intrinsicRatio);
     }
 
+    // TODO(davve): In order to maintain aspect ratio the intrinsic
+    // size is faked from the viewBox as a last resort. This may cause
+    // unwanted side effects. Preferably we should be able to signal
+    // the intrinsic ratio in another way.
+    if (intrinsicSize.isEmpty())
+        intrinsicSize = rootElement->currentViewBoxRect().size();
+
     if (!intrinsicSize.isEmpty())
         return expandedIntSize(intrinsicSize);
 
     // As last resort, use CSS replaced element fallback size.
     return IntSize(300, 150);
 }
 
 void SVGImage::drawForContainer(GraphicsContext* context, const FloatSize containerSize, float zoom, const FloatRect& dstRect,
     const FloatRect& srcRect, SkXfermode::Mode compositeOp)
 {
@@ skipping 269 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }