Mojo C++ bindings: support sync methods - part 1.

mojo/public/cpp/bindings/lib/message_builder.h

 // 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 30 matching lines @@
                               uint64_t request_id);
 };
 
 class RequestMessageBuilder : public MessageWithRequestIDBuilder {
  public:
   RequestMessageBuilder(uint32_t name, size_t payload_size)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
                                     kMessageExpectsResponse,
                                     0) {}
+
+  RequestMessageBuilder(uint32_t name,
+                        size_t payload_size,
+                        uint32_t extra_flags)
+      : MessageWithRequestIDBuilder(name,
+                                    payload_size,
+                                    kMessageExpectsResponse | extra_flags,
+                                    0) {}
 };
 
 class ResponseMessageBuilder : public MessageWithRequestIDBuilder {
  public:
   ResponseMessageBuilder(uint32_t name,
                          size_t payload_size,
                          uint64_t request_id)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
                                     kMessageIsResponse,
                                     request_id) {}
+
+  ResponseMessageBuilder(uint32_t name,
+                         size_t payload_size,
+                         uint64_t request_id,
+                         uint32_t extra_flags)
+      : MessageWithRequestIDBuilder(name,
+                                    payload_size,
+                                    kMessageIsResponse | extra_flags,
+                                    request_id) {}
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_MESSAGE_BUILDER_H_