Add a utility class to call stream methods implemented with v8 extras.

third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h

 /*
  * Copyright (C) 2010 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 60 matching lines @@
 
 template <typename T>
 inline bool v8Call(v8::Maybe<T> maybe, T& outVariable, v8::TryCatch& tryCatch)
 {
     bool success = v8Call(maybe, outVariable);
     ASSERT(success || tryCatch.HasCaught());
     return success;
 }
 
 template <typename T>
+inline bool v8Call(v8::MaybeLocal<T> maybeLocal, v8::Local<T>& outVariable)
+{
+    return maybeLocal.ToLocal(&outVariable);
+}
+
+template <typename T>
 inline bool v8Call(v8::MaybeLocal<T> maybeLocal, v8::Local<T>& outVariable, v8::TryCatch& tryCatch)
 {
     bool success = maybeLocal.ToLocal(&outVariable);
     ASSERT(success || tryCatch.HasCaught());
     return success;
 }
 
 template <typename T>
 inline T v8CallOrCrash(v8::Maybe<T> maybe)
 {
     return maybe.FromJust();
 }
 
 template <typename T>
 inline v8::Local<T> v8CallOrCrash(v8::MaybeLocal<T> maybeLocal)
 {
     return maybeLocal.ToLocalChecked();
 }
 
 // The last "else" is to avoid dangling else problem.
 #define V8_CALL(outVariable, handle, methodCall, failureExpression)                \
     if (handle.IsEmpty() || !v8Call(handle->methodCall, outVariable)) { \
         failureExpression;                                                         \
     } else
 
 } // namespace blink
 
 #endif // V8BindingMacros_h