Implement basic parts of hit regions on canvas2d.

Source/bindings/v8/Dictionary.cpp

 /*
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  * modification, are permitted provided that the following conditions
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 #include "config.h"
 #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"
 #include "bindings/core/v8/V8Storage.h"
 #include "bindings/core/v8/V8TextTrack.h"
 #include "bindings/core/v8/V8VoidCallback.h"
 #include "bindings/core/v8/V8Window.h"
 #include "bindings/modules/v8/V8Gamepad.h"
 #include "bindings/modules/v8/V8HeaderMap.h"
 #include "bindings/modules/v8/V8IDBKeyRange.h"
@@ skipping 372 matching lines @@
 {
     v8::Local<v8::Value> v8Value;
     if (!getKey(key, v8Value) || WebCore::isUndefinedOrNull(v8Value))
         return false;
 
     TOSTRING_DEFAULT(V8StringResource<>, stringValue, v8Value, false);
     value = stringValue;
     return true;
 }
 
+bool Dictionary::getWithUndefinedOrNullCheck(const String& key, RefPtrWillBeMember<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;
     if (!getKey(key, v8Value))
         return false;
 
     value = V8Uint8Array::toNativeWithTypeCheck(m_isolate, v8Value);
     return true;
 }
 
@@ skipping 315 matching lines @@
 
     return *this;
 }
 
 void Dictionary::ConversionContext::throwTypeError(const String& detail)
 {
     exceptionState().throwTypeError(detail);
 }
 
 } // namespace WebCore