[Mojo Video Capture] Hook up connection lost events

content/browser/renderer_host/media/video_capture_device_launch_observer.h

 // Copyright 2017 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_LAUNCH_OBSERVER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_LAUNCH_OBSERVER_H_
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 class VideoCaptureController;
 
 class CONTENT_EXPORT VideoCaptureDeviceLaunchObserver {
  public:
   virtual ~VideoCaptureDeviceLaunchObserver() {}
   virtual void OnDeviceLaunched(VideoCaptureController* controller) = 0;
   virtual void OnDeviceLaunchFailed(VideoCaptureController* controller) = 0;
   virtual void OnDeviceLaunchAborted() = 0;
+  virtual void OnDeviceConnectionLost(VideoCaptureController* controller) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_LAUNCH_OBSERVER_H_