Hook up WebRTC logging extension API to the underlying functionality.

chrome/common/media/webrtc_logging_messages.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.
 
 // IPC messages for WebRTC logging.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "ipc/ipc_message_macros.h"
 
 #define IPC_MESSAGE_START WebRtcLoggingMsgStart
 
 // Messages sent from the renderer to the browser.
 
-// Request to open a log.
-IPC_MESSAGE_CONTROL2(WebRtcLoggingMsg_OpenLog,
-                     std::string /* app_session_id */,
-                     std::string /* app_url */)
+// Notification that the log has been closed.
+IPC_MESSAGE_CONTROL0(WebRtcLoggingMsg_LoggingStopped)
 
 // Messages sent from the browser to the renderer.
 
-// Notification that a log could not be opened.
-IPC_MESSAGE_CONTROL0(WebRtcLoggingMsg_OpenLogFailed)
-
-// Notification that a log has been opened.
-IPC_MESSAGE_CONTROL2(WebRtcLoggingMsg_LogOpened,
+// Tells the renderer to open the log.
+IPC_MESSAGE_CONTROL2(WebRtcLoggingMsg_StartLogging,
                      base::SharedMemoryHandle /* handle */,
                      uint32 /* length */)
+
+// Tells the renderer to close the log.
+IPC_MESSAGE_CONTROL0(WebRtcLoggingMsg_StopLogging)