Implement basic parts of hit regions on canvas2d.

Source/bindings/v8/Dictionary.cpp

Index: Source/bindings/v8/Dictionary.cpp
diff --git a/Source/bindings/v8/Dictionary.cpp b/Source/bindings/v8/Dictionary.cpp
index 55bb17c1ff031e1137096822727c5575b27a5d70..52140c9d6e8f389464bd190eadf74d0af75184c6 100644
--- a/Source/bindings/v8/Dictionary.cpp
+++ b/Source/bindings/v8/Dictionary.cpp
@@ -27,6 +27,7 @@
 #include "bindings/v8/Dictionary.h"
 
 #include "bindings/core/v8/V8DOMError.h"
+#include "bindings/core/v8/V8Element.h"
 #include "bindings/core/v8/V8EventTarget.h"
 #include "bindings/core/v8/V8MediaKeyError.h"
 #include "bindings/core/v8/V8MessagePort.h"
@@ -419,6 +420,16 @@ bool Dictionary::getWithUndefinedOrNullCheck(const String& key, String& value) c
     return true;
 }
 
+bool Dictionary::getWithUndefinedOrNullCheck(const String& key, RefPtr<Element>& value) const
+{
+    v8::Local<v8::Value> v8Value;
+    if (!getKey(key, v8Value) || WebCore::isUndefinedOrNull(v8Value))
+        return false;
+
+    value = V8Element::toNativeWithTypeCheck(m_isolate, v8Value);
+    return true;
+}
+
 bool Dictionary::get(const String& key, RefPtr<Uint8Array>& value) const
 {
     v8::Local<v8::Value> v8Value;