LayoutSVGImage should work correctly even when image size is unavailable

third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h

Index: third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
index 8ef0838e179e4cc97762b7f85cdebdcd4341cb87..2cafe274fdddd13894f411bd3d6fc38f56ce01b9 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
@@ -85,6 +85,10 @@ class CORE_EXPORT ImageResourceContent final
   void addObserver(ImageResourceObserver*);
   void removeObserver(ImageResourceObserver*);
 
+  bool isSizeAvailable() const {
+    return m_sizeAvailable == Image::SizeAvailable;
+  }
+
   DECLARE_TRACE();
 
   // Redirecting methods to Resource.