Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

ipc/ipc_message_macros.h

 // Copyright (c) 2006-2008 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 //
 // In your XXX_messages_internal.h file, before defining any messages do:
 //     #define IPC_MESSAGE_START XMsgStart
 // XMstStart value is from the IPCMessageStart enum in ipc_message_utils.h, and
@@ skipping 1145 matching lines @@
     static void Log(std::string* name, const Message* msg, std::string* l); \
   }; \
   IPC_SYNC_MESSAGE_ROUTED5_4_EXTRA(msg_class, type1_in, type2_in, type3_in, type4_in, type5_in, type1_out, type2_out, type3_out, type4_out)
 
 
 
 // Message crackers and handlers.
 // Prefer to use the IPC_BEGIN_MESSAGE_MAP_EX to the older macros since they
 // allow you to detect when a message could not be de-serialized. Usage:
 //
-//   void MyClass::OnMessageReceived(const IPC::Message& msg) {
+//   bool MyClass::OnMessageReceived(const IPC::Message& msg) {
+//     bool handled = true;
 //     bool msg_is_good = false;
 //     IPC_BEGIN_MESSAGE_MAP_EX(MyClass, msg, msg_is_good)
 //       IPC_MESSAGE_HANDLER(MsgClassOne, OnMsgClassOne)
 //       ...more handlers here ...
 //       IPC_MESSAGE_HANDLER(MsgClassTen, OnMsgClassTen)
+//       IPC_MESSAGE_UNHANDLED(handled = false)
 //     IPC_END_MESSAGE_MAP_EX()
 //     if (!msg_is_good) {
 //       // Signal error here or terminate offending process.
 //     }
+//     return handled;
 //   }
 
 
-#define IPC_DEFINE_MESSAGE_MAP(class_name) \
-void class_name::OnMessageReceived(const IPC::Message& msg) \
-  IPC_BEGIN_MESSAGE_MAP(class_name, msg)
-
 #define IPC_BEGIN_MESSAGE_MAP_EX(class_name, msg, msg_is_ok) \
   { \
     typedef class_name _IpcMessageHandlerClass; \
     const IPC::Message& ipc_message__ = msg; \
     bool& msg_is_ok__ = msg_is_ok; \
     switch (ipc_message__.type()) { \
 
 #define IPC_BEGIN_MESSAGE_MAP(class_name, msg) \
   { \
     typedef class_name _IpcMessageHandlerClass; \
@@ skipping 44 matching lines @@
   } \
 }
 
 #define IPC_END_MESSAGE_MAP_EX() \
   } \
 }
 
 // This corresponds to an enum value from IPCMessageStart.
 #define IPC_MESSAGE_CLASS(message) \
   message.type() >> 16