getUserMeida: report device starting states

media/capture/video/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/capture/video/win/video_capture_device_mf_win.h"
 
 #include <mfapi.h>
 #include <mferror.h>
 #include <stddef.h>
 
@@ skipping 221 matching lines @@
       ScopedComPtr<IMFMediaType> type;
       hr = reader_->GetNativeMediaType(
           kFirstVideoStream, found_capability.stream_index, type.Receive());
       if (SUCCEEDED(hr)) {
         hr = reader_->SetCurrentMediaType(kFirstVideoStream, NULL, type.get());
         if (SUCCEEDED(hr)) {
           hr =
               reader_->ReadSample(kFirstVideoStream, 0, NULL, NULL, NULL, NULL);
           if (SUCCEEDED(hr)) {
             capture_format_ = found_capability.supported_format;
+            client_->OnStarted();
             capture_ = true;
             return;
           }
         }
       }
     }
   }
 
   OnError(FROM_HERE, hr);
 }
@@ skipping 58 matching lines @@
     HRESULT hr) {
   if (client_.get()) {
     client_->OnError(
         from_here,
         base::StringPrintf("VideoCaptureDeviceMFWin: %s",
                            logging::SystemErrorCodeToString(hr).c_str()));
   }
 }
 
 }  // namespace media