Release the camera when WebRTC is not visible in Android

content/browser/renderer_host/media/video_capture_host.h

Index: content/browser/renderer_host/media/video_capture_host.h
diff --git a/content/browser/renderer_host/media/video_capture_host.h b/content/browser/renderer_host/media/video_capture_host.h
index 15a618a2f15c6b749e3192ff9928c1ce572726a1..68edae1f85372af71c1eda46c587a2b21079e336 100644
--- a/content/browser/renderer_host/media/video_capture_host.h
+++ b/content/browser/renderer_host/media/video_capture_host.h
@@ -123,6 +123,10 @@ class CONTENT_EXPORT VideoCaptureHost
   // IPC message: Pause capture on device referenced by |device_id|.
   void OnPauseCapture(int device_id);
 
+  void OnResumeCapture(int device_id,
+                       media::VideoCaptureSessionId session_id,
+                       const media::VideoCaptureParams& params);
+
   // IPC message: Receive an empty buffer from renderer. Send it to device
   // referenced by |device_id|.
   void OnReceiveEmptyBuffer(int device_id, int buffer_id, uint32 sync_point);