Support Promises instrumentation on backend.

Source/bindings/v8/custom/V8PromiseCustom.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:
  * 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 52 matching lines @@
     };
 
     static v8::Local<v8::Object> createPromise(v8::Handle<v8::Object> creationContext, v8::Isolate*);
 
     // |promise| must be a Promise instance.
     static v8::Local<v8::Object> getInternal(v8::Handle<v8::Object> promise);
 
     // |internal| must be a Promise internal object.
     static PromiseState getState(v8::Handle<v8::Object> internal);
 
-    // |internal| must be a Promise internal object.
-    // Set a |promise|'s state and result that correspond to the state.
-    static void setState(v8::Handle<v8::Object> internal, PromiseState, v8::Handle<v8::Value>, v8::Isolate*);
-
     // Return true if |maybePromise| is a Promise instance.
     static bool isPromise(v8::Handle<v8::Value> maybePromise, v8::Isolate*);
 
     // Coerces |maybePromise| to a Promise instance.
     static v8::Local<v8::Object> toPromise(v8::Handle<v8::Value> maybePromise, v8::Isolate*);
 
     // |promise| must be a Promise instance.
     static void resolve(v8::Handle<v8::Object> promise, v8::Handle<v8::Value> result, v8::Isolate*);
 
     // |promise| must be a Promise instance.
@@ skipping 40 matching lines @@
 
     // |promise| must be a Promise instance.
     // Applies a transformation to an argument and use it to update derived
     // promies.
     static void callHandler(v8::Handle<v8::Object> promise, v8::Handle<v8::Function> handler, v8::Handle<v8::Value> argument, PromiseState originatorState, v8::Isolate*);
 };
 
 } // namespace WebCore
 
 #endif // V8PromiseCustom_h