Implement browser-side logging to WebRtc log

media/video/capture/win/video_capture_device_mf_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_mf_win.h"
 
 #include <mfapi.h>
 #include <mferror.h>
 
 #include "base/lazy_instance.h"
@@ skipping 414 matching lines @@
       // fail with HRESULT_FROM_WINHRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION).
       // It's not clear to me why this is, but it is possible that it has
       // something to do with this bug:
       // http://support.microsoft.com/kb/979567
       OnError(hr);
     }
   }
 }
 
 void VideoCaptureDeviceMFWin::OnError(HRESULT hr) {
-  DLOG(ERROR) << "VideoCaptureDeviceMFWin: " << std::hex << hr;
+  std::stringstream log_msg;
+  log_msg << "VideoCaptureDeviceMFWin: " << std::hex << hr;
+  DLOG(ERROR) << log_msg;
   if (client_.get())
-    client_->OnError();
+    client_->OnError(log_msg.str());
 }
 
 }  // namespace media