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

media/video/capture/win/video_capture_device_win.cc

 // 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.
 
 #include "media/video/capture/win/video_capture_device_win.h"
 
 #include <algorithm>
 #include <list>
 
 #include "base/command_line.h"
@@ skipping 572 matching lines @@
       }
       capabilities_.Add(capability);
     }
     DeleteMediaType(media_type);
     media_type = NULL;
   }
 
   return !capabilities_.empty();
 }
 
-void VideoCaptureDeviceWin::SetErrorState(const char* reason) {
+void VideoCaptureDeviceWin::SetErrorState(const std::string& reason) {
   DCHECK(CalledOnValidThread());
   DVLOG(1) << reason;
   state_ = kError;
-  client_->OnError();
+  client_->OnError(reason);
 }
 }  // namespace media