Adding WebRTC logging filter, handler and handler host.

content/common/webrtc_logging_messages.h

Index: content/common/webrtc_logging_messages.h
diff --git a/content/common/webrtc_logging_messages.h b/content/common/webrtc_logging_messages.h
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index 0000000000000000000000000000000000000000..dee455639ab755fb3b88fee4e85b252fb225bc92
--- /dev/null
+++ b/content/common/webrtc_logging_messages.h
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+// Copyright (c) 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/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_CONTROL0(WebRtcLoggingMsg_OpenLog)
+
+// Messages sent from the browser to the renderer.
+
+// Notification that a log could not be opened.
+// TODO(grunell): Maybe a general fail msg, with fail reason in it.
+IPC_MESSAGE_CONTROL0(WebRtcLoggingMsg_OpenLogFailed)
+
+// Notification that a log has been opened.
+IPC_MESSAGE_CONTROL2(WebRtcLoggingMsg_LogOpened,
+                     base::SharedMemoryHandle /* handle */,
+                     uint32 /* length */)