Mojo: Use new message APIs to reduce copying

mojo/public/cpp/bindings/lib/router.cc

 // Copyright 2014 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 "mojo/public/cpp/bindings/lib/router.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 135 matching lines @@
 
 bool Router::AcceptWithResponder(Message* message, MessageReceiver* responder) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(message->has_flag(kMessageExpectsResponse));
 
   // Reserve 0 in case we want it to convey special meaning in the future.
   uint64_t request_id = next_request_id_++;
   if (request_id == 0)
     request_id = next_request_id_++;
 
+  bool is_sync = message->has_flag(kMessageIsSync);
   message->set_request_id(request_id);
   if (!connector_.Accept(message))
     return false;
 
-  if (!message->has_flag(kMessageIsSync)) {
+  if (!is_sync) {
     // We assume ownership of |responder|.
     async_responders_[request_id] = base::WrapUnique(responder);
     return true;
   }
 
   bool response_received = false;
   std::unique_ptr<MessageReceiver> sync_responder(responder);
   sync_responses_.insert(std::make_pair(
       request_id, base::WrapUnique(new SyncResponseInfo(&response_received))));
 
@@ skipping 137 matching lines @@
   }
 
   encountered_error_ = true;
   error_handler_.Run();
 }
 
 // ----------------------------------------------------------------------------
 
 }  // namespace internal
 }  // namespace mojo