bindings: Introduces ScriptWrappableBase to provide the internal pointer.

Source/bindings/core/v8/ScriptWrappable.cpp

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  */

[haraken, 2014/07/28 15:43:57]

Use the 3-line copyright.

[Yuki, 2014/07/28 15:48:14]

Sorry, what's the 3-line copyright?  I just copy&pasted this copyright from
ScriptWrappable.h.

 
-#ifndef AesKeyAlgorithm_h
-#define AesKeyAlgorithm_h
-
+#include "config.h"
 #include "bindings/core/v8/ScriptWrappable.h"
-#include "modules/crypto/KeyAlgorithm.h"
-#include "platform/heap/Handle.h"
-#include "wtf/Forward.h"
 
 namespace blink {
 
-class AesKeyAlgorithm : public KeyAlgorithm {
-public:
-    static AesKeyAlgorithm* create(const WebCryptoKeyAlgorithm&);
+struct SameSizeAsScriptWrappableBase { };
 
-    unsigned short length();
+COMPILE_ASSERT(sizeof(ScriptWrappableBase) <= sizeof(SameSizeAsScriptWrappableBase), ScriptWrappableBase_should_stay_small);
 
-    virtual void trace(Visitor*) OVERRIDE;
-
-private:
-    explicit AesKeyAlgorithm(const WebCryptoKeyAlgorithm&);
+struct SameSizeAsScriptWrappable : public ScriptWrappableBase {
+    virtual ~SameSizeAsScriptWrappable() { }
+    uintptr_t m_wrapperOrTypeInfo;
 };
 
-DEFINE_KEY_ALGORITHM_TYPE_CASTS(AesKeyAlgorithm);
+COMPILE_ASSERT(sizeof(ScriptWrappable) <= sizeof(SameSizeAsScriptWrappable), ScriptWrappable_should_stay_small);
 
 } // namespace blink
-
-#endif