Reland CL to implement browser-side logging to WebRtc log.

content/browser/renderer_host/media/media_stream_manager.h

 // 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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 167 matching lines @@
   // This object gets deleted on the UI thread after the IO thread has been
   // destroyed. So we need to know when IO thread is being destroyed so that
   // we can delete VideoCaptureManager and AudioInputDeviceManager. Normally
   // this is handled by
   // base::MessageLoop::DestructionObserver::WillDestroyCurrentMessageLoop.
   // But for some tests which use TestBrowserThreadBundle, we need to call
   // WillDestroyCurrentMessageLoop explicitly because the notification happens
   // too late. (see http://crbug.com/247525#c14).
   virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
 
+  // Sends log messages to the render processes making device requests, to be
+  // used by the webrtcLoggingPrivate API if requested.
+  void AddLogMessageOnUIThread(const std::string& message);
+
+  // Adds |message| to native logs for outstanding device requests, for use by
+  // render processes requesting logging from webrtcLoggingPrivate API. Safe to
+  // call from any thread.
+  static void SendMessageToNativeLog(const std::string& message);
+
  protected:
   // Used for testing.
   MediaStreamManager();
 
  private:
   // Contains all data needed to keep track of requests.
   class DeviceRequest;
 
   // Cache enumerated device list.
   struct EnumerationCache {
@@ skipping 150 matching lines @@
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_