Leak Detector: Add support for ScriptPromise on Blink side

Source/bindings/core/v8/ScriptPromise.h

 /*
  * Copyright (C) 2013 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
@@ skipping 32 matching lines @@
 class DOMException;
 
 // ScriptPromise is the class for representing Promise values in C++ world.
 // ScriptPromise holds a Promise.
 // So holding a ScriptPromise as a member variable in DOM object causes
 // memory leaks since it has a reference from C++ to V8.
 //
 class CORE_EXPORT ScriptPromise final {
 public:
     // Constructs an empty promise.
-    ScriptPromise() { }
+    ScriptPromise();
 
     // Constructs a ScriptPromise from |promise|.
     // If |promise| is not a Promise object, throws a v8 TypeError.
     ScriptPromise(ScriptState*, v8::Local<v8::Value> promise);
 
+    ScriptPromise(const ScriptPromise&);
+
+    ~ScriptPromise();
+
     ScriptPromise then(v8::Local<v8::Function> onFulfilled, v8::Local<v8::Function> onRejected = v8::Local<v8::Function>());
 
     bool isObject() const
     {
         return m_promise.isObject();
     }
 
     bool isNull() const
     {
         return m_promise.isNull();
@@ skipping 51 matching lines @@
     static ScriptPromise cast(ScriptState*, const ScriptValue& /*value*/);
     static ScriptPromise cast(ScriptState*, v8::Local<v8::Value> /*value*/);
 
     static ScriptPromise reject(ScriptState*, const ScriptValue&);
     static ScriptPromise reject(ScriptState*, v8::Local<v8::Value>);
 
     static ScriptPromise rejectWithDOMException(ScriptState*, DOMException*);
 
     static v8::Local<v8::Promise> rejectRaw(ScriptState*, v8::Local<v8::Value>);
 
+    static unsigned instanceCount() { return s_instanceCount; }
+
     // This is a utility class intended to be used internally.
     // ScriptPromiseResolver is for general purpose.
     class CORE_EXPORT InternalResolver final {
     public:
         explicit InternalResolver(ScriptState*);
         v8::Local<v8::Promise> v8Promise() const;
         ScriptPromise promise() const;
         void resolve(v8::Local<v8::Value>);
         void reject(v8::Local<v8::Value>);
         void clear() { m_resolver.clear(); }
 
     private:
         ScriptValue m_resolver;
     };
 
 private:
     RefPtr<ScriptState> m_scriptState;
     ScriptValue m_promise;
+
+    static unsigned s_instanceCount;
 };
 
 } // namespace blink
 
 
 #endif // ScriptPromise_h