Added IsConstructorCall to gin::Arguments.

gin/arguments.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/arguments.h"
 
 #include "base/strings/stringprintf.h"
 #include "gin/converter.h"
 
 namespace gin {
@@ skipping 27 matching lines @@
 
   ThrowTypeError(base::StringPrintf(
       "Error processing argument %d.", next_ - 1));
 }
 
 void Arguments::ThrowTypeError(const std::string& message) const {
   isolate_->ThrowException(v8::Exception::TypeError(
       StringToV8(isolate_, message)));
 }
 
+bool Arguments::IsConstructCall() const {
+  return info_->IsConstructCall();
+}
+
 }  // namespace gin