add HitTestCanvasResult Class instend of std::pair<Element*, String>

third_party/WebKit/Source/core/layout/HitTestResult.h

Index: third_party/WebKit/Source/core/layout/HitTestResult.h
diff --git a/third_party/WebKit/Source/core/layout/HitTestResult.h b/third_party/WebKit/Source/core/layout/HitTestResult.h
index 9e616bf82357a38172f3a496064d0e0a6a4e30f5..ae38618b2696fd826235635938b19d9f8560dd1e 100644
--- a/third_party/WebKit/Source/core/layout/HitTestResult.h
+++ b/third_party/WebKit/Source/core/layout/HitTestResult.h
@@ -24,6 +24,7 @@
 
 #include "core/CoreExport.h"
 #include "core/editing/PositionWithAffinity.h"
+#include "core/layout/HitTestCanvasResult.h"
 #include "core/layout/HitTestLocation.h"
 #include "core/layout/HitTestRequest.h"
 #include "platform/geometry/FloatQuad.h"
@@ -117,12 +118,14 @@ public:
 
     const HitTestLocation& hitTestLocation() const { return m_hitTestLocation; }
     const HitTestRequest& hitTestRequest() const { return m_hitTestRequest; }
+    HitTestCanvasResult* hitTestCanvasResult() const { return m_hitTestCanvasResult.get(); }
 
     void setInnerNode(Node*);
     HTMLAreaElement* imageAreaForImage() const;
     void setURLElement(Element*);
     void setScrollbar(Scrollbar*);
     void setIsOverWidget(bool b) { m_isOverWidget = b; }
+    void setHitCanvasRegion(HitTestCanvasResult*);
 
     bool isSelected() const;
     String title(TextDirection&) const;
@@ -165,6 +168,7 @@ private:
 
     HitTestLocation m_hitTestLocation;
     HitTestRequest m_hitTestRequest;
+    Member<HitTestCanvasResult> m_hitTestCanvasResult;
     bool m_cacheable;
 
     Member<Node> m_innerNode;