WIP bindings: Expand usage of NativeValueTraits.

third_party/WebKit/Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. 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.
@@ skipping 957 matching lines @@
   static inline v8::Local<v8::Value> nativeValue(
       v8::Isolate* isolate,
       v8::Local<v8::Value> value,
       ExceptionState& exceptionState) {
     return value;
   }
 };
 
 template <>
 struct NativeValueTraits<ScriptValue> {
+  using ImplType = ScriptValue;
   static inline ScriptValue nativeValue(v8::Isolate* isolate,
                                         v8::Local<v8::Value> value,
                                         ExceptionState& exceptionState) {
     return ScriptValue(ScriptState::current(isolate), value);
   }
 };
 
+class Promise;
+template <>
+struct NativeValueTraits<Promise> {
+  using ImplType = ScriptPromise;
+  static inline ScriptPromise nativeValue(v8::Isolate* isolate,
+                                          v8::Local<v8::Value> value,
+                                          ExceptionState& exceptionState) {
+    return ScriptPromise::cast(ScriptState::current(isolate), value);
+  }
+};
+
 template <typename T>
 struct NativeValueTraits<Vector<T>> {
   static inline Vector<T> nativeValue(v8::Isolate* isolate,
                                       v8::Local<v8::Value> value,
                                       ExceptionState& exceptionState) {
     return toImplArray<Vector<T>>(value, 0, isolate, exceptionState);
   }
 };
 
 CORE_EXPORT v8::Isolate* toIsolate(ExecutionContext*);
@@ skipping 165 matching lines @@
 // If the argument isn't an object, this will crash.
 CORE_EXPORT v8::Local<v8::Value> freezeV8Object(v8::Local<v8::Value>,
                                                 v8::Isolate*);
 
 CORE_EXPORT v8::Local<v8::Value> fromJSONString(v8::Isolate*,
                                                 const String& stringifiedJSON,
                                                 ExceptionState&);
 }  // namespace blink
 
 #endif  // V8Binding_h