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

content/browser/renderer_host/media/video_capture_device_impl.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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 53 matching lines @@
   }
 
   // Updates capture resolution based on the supplied source size and the
   // maximum frame size.
   void UpdateCaptureSize(const gfx::Size& source_size);
 
   // Stop new captures from happening (but doesn't forget the client).
   void Stop();
 
   // Signal an error to the client.
-  void ReportError();
+  void ReportError(const std::string& reason);
 
  private:
   friend class base::RefCountedThreadSafe<ThreadSafeCaptureOracle>;
   virtual ~ThreadSafeCaptureOracle();
 
   // Callback invoked on completion of all captures.
   void DidCaptureFrame(
       scoped_refptr<media::VideoCaptureDevice::Client::Buffer> buffer,
       int frame_number,
       base::TimeTicks timestamp,
@@ skipping 73 matching lines @@
     kError
   };
 
   void TransitionStateTo(State next_state);
 
   // Called on the IO thread in response to StartCaptureMachine().
   // |success| is true if capture machine succeeded to start.
   void CaptureStarted(bool success);
 
   // Stops capturing and notifies client_ of an error state.
-  void Error();
+  void Error(const std::string& reason);
 
   // Tracks that all activity occurs on the media stream manager's thread.
   base::ThreadChecker thread_checker_;
 
   // Current lifecycle state.
   State state_;
 
   // Tracks the CaptureMachine that's doing work on our behalf on the UI thread.
   // This value should never be dereferenced by this class, other than to
   // create and destroy it on the UI thread.
   scoped_ptr<VideoCaptureMachine> capture_machine_;
 
   // Our thread-safe capture oracle which serves as the gateway to the video
   // capture pipeline. Besides the WCVCD itself, it is the only component of the
   // system with direct access to |client_|.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceImpl);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_