Parse the link element's size attribute

Source/core/html/HTMLLinkElement.h

Index: Source/core/html/HTMLLinkElement.h
diff --git a/Source/core/html/HTMLLinkElement.h b/Source/core/html/HTMLLinkElement.h
index 8508abd87859dd7fb6ec5fe4486ef293a032010f..e8a2c5d2a7b9f7520c5705f2d3cc9516acd07f7c 100644
--- a/Source/core/html/HTMLLinkElement.h
+++ b/Source/core/html/HTMLLinkElement.h
@@ -133,8 +133,8 @@ public:
 
     IconType iconType() const;
 
-    // the icon size string as parsed from the HTML attribute
-    const AtomicString& iconSizes() const;
+    // the icon sizes as parsed from the HTML attribute
+    const Vector<IntSize>& iconSizes() const;
 
     bool async() const;
 
@@ -163,6 +163,10 @@ public:
     bool shouldProcessStyle() { return linkResourceToProcess() && linkStyle(); }
     bool isCreatedByParser() const { return m_createdByParser; }
 
+    // Parse the icon size attribute into |iconSizes|, make this method public
+    // visible for testing purpose.
+    static void parseSizesAttribute(const AtomicString& value, Vector<IntSize>& iconSizes);
+
 private:
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
@@ -199,6 +203,7 @@ private:
     String m_type;
     String m_media;
     RefPtr<DOMSettableTokenList> m_sizes;
+    Vector<IntSize> m_iconSizes;
     LinkRelAttribute m_relAttribute;
 
     bool m_createdByParser;