video_capture_manager: filter out unexpected app state changes on Android

content/browser/renderer_host/media/video_capture_manager.h

   // 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.
 
 // VideoCaptureManager is used to open/close, start/stop, enumerate available
 // video capture devices, and manage VideoCaptureController's.
 // All functions are expected to be called from Browser::IO thread. Some helper
 // functions (*OnDeviceThread) will dispatch operations to the device thread.
 // VideoCaptureManager will open OS dependent instances of VideoCaptureDevice.
 // A device can only be opened once.
@@ skipping 268 matching lines @@
   // use them.  This variable is only checked and set on the IO thread.
   bool capture_device_api_initialized_ = false;
 #endif
 
 #if defined(OS_ANDROID)
   void ReleaseDevices();
   void ResumeDevices();
 
   std::unique_ptr<base::android::ApplicationStatusListener>
       app_status_listener_;
+  bool application_state_has_running_activities_;
 #endif
 
   // The message loop of media stream device thread, where VCD's live.
   scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 
   // Only accessed on Browser::IO thread.
   MediaStreamProviderListener* listener_;
   media::VideoCaptureSessionId new_capture_session_id_;
 
   // An entry is kept in this map for every session that has been created via
@@ skipping 29 matching lines @@
   // Map used by DesktopCapture.
   std::map<media::VideoCaptureSessionId, gfx::NativeViewId>
       notification_window_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_