Make WebMIDI use blink Promise.

Source/bindings/v8/V8Binding.h

Index: Source/bindings/v8/V8Binding.h
diff --git a/Source/bindings/v8/V8Binding.h b/Source/bindings/v8/V8Binding.h
index 3e1e3d556611ab4c9011aa7580e1e0cce070f057..dc33490b34162f59ab59ab5a369c535ac456235e 100644
--- a/Source/bindings/v8/V8Binding.h
+++ b/Source/bindings/v8/V8Binding.h
@@ -709,6 +709,13 @@ void moveEventListenerToNewWrapper(v8::Handle<v8::Object>, EventListener* oldVal
 // Each specialized implementation will be generated.
 template<typename T>
 v8::Handle<v8::Value> toV8NoInline(T* impl, v8::Handle<v8::Object> creationContext, v8::Isolate*);
+template<typename T>
+v8::Handle<v8::Value> toV8NoInline(T* impl, ExecutionContext* context)
+{
+    v8::Isolate* isolate = toIsolate(context);
+    v8::Handle<v8::Context> v8Context = toV8Context(context, DOMWrapperWorld::current(isolate));
+    return toV8NoInline(impl, v8Context->Global(), isolate);
+}
 
 // Result values for platform object 'deleter' methods,
 // http://www.w3.org/TR/WebIDL/#delete