Implement a new flow event API that allows binding flow events and regular events.

ipc/ipc_channel_posix.cc

 // Copyright (c) 2012 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 "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/socket.h>
@@ skipping 493 matching lines @@
 bool ChannelPosix::Send(Message* message) {
   DCHECK(!message->HasMojoHandles());
   DVLOG(2) << "sending message @" << message << " on channel @" << this
            << " with type " << message->type()
            << " (" << output_queue_.size() << " in queue)";
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   Logging::GetInstance()->OnSendMessage(message, "");
 #endif  // IPC_MESSAGE_LOG_ENABLED
 
+  TRACE_EVENT_WITH_FLOW0("ipc", "ChannelPosix::Send", message->flags(),
+      TRACE_EVENT_FLAG_FLOW_OUT);
   message->TraceMessageBegin();
   output_queue_.push(message);
   if (!is_blocked_on_write_ && !waiting_connect_) {
     return ProcessOutgoingMessages();
   }
 
   return true;
 }
 
 AttachmentBroker* ChannelPosix::GetAttachmentBroker() {
@@ skipping 505 matching lines @@
 }
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelPosix::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC