[svg] in img element doesn't render correctly when height is changed dynamically.

Source/core/rendering/svg/RenderSVGRoot.h

Index: Source/core/rendering/svg/RenderSVGRoot.h
diff --git a/Source/core/rendering/svg/RenderSVGRoot.h b/Source/core/rendering/svg/RenderSVGRoot.h
index 0d8c998b11e09f9d6246dae9ba2ffaa1eb46136e..6e1fc8187b25bff9dbfee8f8d224d54b3f30d3b8 100644
--- a/Source/core/rendering/svg/RenderSVGRoot.h
+++ b/Source/core/rendering/svg/RenderSVGRoot.h
@@ -53,7 +53,15 @@ public:
     virtual void setNeedsTransformUpdate() OVERRIDE { m_needsBoundariesOrTransformUpdate = true; }
 
     IntSize containerSize() const { return m_containerSize; }
-    void setContainerSize(const IntSize& containerSize) { m_containerSize = containerSize; }
+    void setContainerSize(const IntSize& containerSize)
+    {
+        // SVGImage::draw() does a view layout prior to painting,
+        // and we need that layout to know of the new size otherwise
+        // the rendering may be incorrectly using the old size.
+        if (m_containerSize != containerSize)
+            setNeedsLayout();
+        m_containerSize = containerSize;
+    }
 
     virtual bool hasRelativeIntrinsicLogicalWidth() const OVERRIDE;
     virtual bool hasRelativeLogicalHeight() const OVERRIDE;