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

content/browser/renderer_host/media/video_capture_manager.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 "content/browser/renderer_host/media/video_capture_manager.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 195 matching lines @@
 #endif  // defined(ENABLE_SCREEN_CAPTURE)
       break;
     }
     default: {
       NOTIMPLEMENTED();
       break;
     }
   }
 
   if (!video_capture_device) {
-    device_client->OnError();
+    device_client->OnError("Could not create capture device");
     return;
   }
 
   video_capture_device->AllocateAndStart(params, device_client.Pass());
   entry->video_capture_device = video_capture_device.Pass();
 }
 
 void VideoCaptureManager::StartCaptureForClient(
     media::VideoCaptureSessionId session_id,
     const media::VideoCaptureParams& params,
@@ skipping 317 matching lines @@
     DeviceInfos& device_vector) {
   for (DeviceInfos::iterator it = device_vector.begin();
        it != device_vector.end(); ++it) {
     if (it->name.id() == id)
       return &(*it);
   }
   return NULL;
 }
 
 }  // namespace content