Adding WebRTC logging filter, handler and handler host.

content/browser/renderer_host/webrtc_logging_handler_host.h

+// 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_WEBRTC_LOGGING_HANDLER_HOST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_WEBRTC_LOGGING_HANDLER_HOST_H_
+
+#include "base/basictypes.h"
+#include "base/shared_memory.h"
+#include "content/public/browser/browser_message_filter.h"
+
+namespace content {
+
+// WebRtcLoggingHandlerHost handles operations regarding the WebRTC logging:
+// opening and closing shared memory buffer that the handler in the renderer
+// process writes to.
+class WebRtcLoggingHandlerHost : public BrowserMessageFilter {
+ public:
+  WebRtcLoggingHandlerHost();
+
+ private:
+  // BrowserMessageFilter implementation.
+  virtual void OnChannelClosing() OVERRIDE;
+  virtual void OnDestruct() const OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+  friend class BrowserThread;
+  friend class base::DeleteHelper<WebRtcLoggingHandlerHost>;
+
+  virtual ~WebRtcLoggingHandlerHost();
+
+  void OnOpenLog();
+
+  base::SharedMemory shared_memory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRtcLoggingHandlerHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_WEBRTC_LOGGING_HANDLER_HOST_H_