Mac Video Capture: Connect error logging to WebRTC Log

media/video/capture/video_capture_device.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.
 //
 // VideoCaptureDevice is the abstract base class for realizing video capture
 // device support in Chromium. It provides the interface for OS dependent
 // implementations.
 // The class is created and functions are invoked on a thread owned by
 // VideoCaptureManager. Capturing is done on other threads, depending on the OS
 // specific implementation.
@@ skipping 169 matching lines @@
     // additional copies in the browser process.
     virtual void OnIncomingCapturedVideoFrame(
         const scoped_refptr<Buffer>& buffer,
         const VideoCaptureFormat& buffer_format,
         const scoped_refptr<media::VideoFrame>& frame,
         base::TimeTicks timestamp) = 0;
 
     // An error has occurred that cannot be handled and VideoCaptureDevice must
     // be StopAndDeAllocate()-ed. |reason| is a text description of the error.
     virtual void OnError(const std::string& reason) = 0;
+
+    // VideoCaptureDevice requests the |message| to be logged.
+    virtual void OnLog(const std::string& message) {}
   };
 
   // Creates a VideoCaptureDevice object.
   // Return NULL if the hardware is not available.
   static VideoCaptureDevice* Create(
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       const Name& device_name);
   virtual ~VideoCaptureDevice();
 
   // Gets the names of all video capture devices connected to this computer.
@@ skipping 30 matching lines @@
   int GetPowerLineFrequencyForLocation() const;
 
  protected:
   static const int kPowerLine50Hz = 50;
   static const int kPowerLine60Hz = 60;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_