Introduce Promise mapping to the IDL generator

Source/bindings/v8/ScriptPromiseResolver.h

Index: Source/bindings/v8/ScriptPromiseResolver.h
diff --git a/Source/bindings/v8/ScriptPromiseResolver.h b/Source/bindings/v8/ScriptPromiseResolver.h
index 18d30523fad4eef50394bc20bae123dba4888b14..40e1d7bbca013f8cbd2432a7157a6db32a96a0b2 100644
--- a/Source/bindings/v8/ScriptPromiseResolver.h
+++ b/Source/bindings/v8/ScriptPromiseResolver.h
@@ -33,6 +33,7 @@
 
 #include "bindings/v8/ScopedPersistent.h"
 #include "bindings/v8/ScriptObject.h"
+#include "bindings/v8/ScriptPromise.h"
 #include "bindings/v8/ScriptState.h"
 #include "bindings/v8/ScriptValue.h"
 #include "wtf/RefPtr.h"
@@ -59,6 +60,13 @@ class ScriptExecutionContext;
 // To use ScriptPromiseResolver out of a v8 context the caller must
 // enter a v8 context, for example by using ScriptScope and ScriptState.
 //
+// If you hold ScriptPromiseResolver as a member variable, it causes memory
+// leaks unless you detach the promise and resolver object manually.
+// So if you no longer need the promise object, you should call detachPromise.
+// And if the operation completes or fails, you should call fulfill / resolve /
+// reject. Destroying ScriptPromiseResolver will also detach the promise and
+// resolver object.
+//

[yusukesuzuki, 2013/09/04 06:37:00]

Added the comment about possible memory leaks.

 class ScriptPromiseResolver : public RefCounted<ScriptPromiseResolver> {
     WTF_MAKE_NONCOPYABLE(ScriptPromiseResolver);
 public:
@@ -83,10 +91,10 @@ public:
     //  - The resolver's resolved flag is not set.
     bool isPending() const;
 
-    ScriptObject promise()
+    ScriptPromise promise()
     {
         ASSERT(v8::Context::InContext());
-        return ScriptObject(ScriptState::current(), m_promise.newLocal(m_isolate));
+        return m_promise;
     }
 
     // Fulfill with a C++ object which can be converted to a v8 object by toV8.
@@ -110,7 +118,7 @@ private:
     void reject(v8::Handle<v8::Value>);
 
     v8::Isolate* m_isolate;
-    ScopedPersistent<v8::Object> m_promise;
+    ScriptPromise m_promise;
     ScopedPersistent<v8::Object> m_resolver;
     bool isPendingInternal() const;
 };