V8 Binding: Introduce toNativeWithTypeCheck

Source/bindings/v8/custom/V8ArrayBufferViewCustom.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 64 matching lines @@
     if (object->IsUint8ClampedArray()) {
         return V8Uint8ClampedArray::toNative(object);
     }
     if (object->IsDataView()) {
         return V8DataView::toNative(object);
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
+ArrayBufferView* V8ArrayBufferView::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
+{
+    return V8ArrayBufferView::hasInstance(value, isolate) ? V8ArrayBufferView::toNative(v8::Handle<v8::Object>::Cast(value)) : 0;
+}
 
 } // namespace WebCore