WebRtcVideoCapturer: SetCaptureState(CS_STOPPED) on Stop and ensure state changes in unittest

talk/media/webrtc/webrtcvideocapturer.cc

 /*
  * libjingle
  * Copyright 2011 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 332 matching lines @@
   LOG(LS_INFO) << "Camera '" << GetId() << "' stopped after capturing "
                << captured_frames_ << " frames and dropping "
                << drop_ratio << "%";
 
   // Clear any pending async invokes (that OnIncomingCapturedFrame may have
   // caused).
   async_invoker_.reset();
 
   SetCaptureFormat(NULL);
   start_thread_ = nullptr;
+  SetCaptureState(CS_STOPPED);
 }
 
 bool WebRtcVideoCapturer::IsRunning() {
   return (module_ != NULL && module_->CaptureStarted());
 }
 
 bool WebRtcVideoCapturer::GetPreferredFourccs(std::vector<uint32_t>* fourccs) {
   if (!fourccs) {
     return false;
   }
@@ skipping 75 matching lines @@
   // Convert units from VideoFrame RenderTimeMs to CapturedFrame (nanoseconds).
   time_stamp = sample.render_time_ms() * rtc::kNumNanosecsPerMillisec;
   data_size = rtc::checked_cast<uint32_t>(length);
   data = buffer;
   rotation = sample.rotation();
 }
 
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VIDEO