handle the case when device is closed before media pipeline is fully initialized.

content/browser/renderer_host/media/video_capture_host.h

Index: content/browser/renderer_host/media/video_capture_host.h
===================================================================
--- content/browser/renderer_host/media/video_capture_host.h	(revision 138673)
+++ content/browser/renderer_host/media/video_capture_host.h	(working copy)
@@ -78,6 +78,7 @@
                            int width,
                            int height,
                            int frame_per_second) OVERRIDE;
+  virtual void OnPaused(const VideoCaptureControllerID& id) OVERRIDE;
   virtual void OnReadyToDelete(const VideoCaptureControllerID& id) OVERRIDE;
 
  private:
@@ -114,29 +115,32 @@
 
   // Called on the IO thread when VideoCaptureController have
   // reported that all DIBs have been returned.
-  void DoDeleteVideoCaptureController(const VideoCaptureControllerID& id);
+  void DoDeleteVideoCaptureControllerOnIOThread(
+      const VideoCaptureControllerID& id);
 
   // Send a newly created buffer to the VideoCaptureMessageFilter.
-  void DoSendNewBuffer(int device_id,
-                       base::SharedMemoryHandle handle,
-                       int length,
-                       int buffer_id);
+  void DoSendNewBufferOnIOThread(int device_id,
+                                 base::SharedMemoryHandle handle,
+                                 int length,
+                                 int buffer_id);
 
   // Send a filled buffer to the VideoCaptureMessageFilter.
-  void DoSendFilledBuffer(int device_id,
-                          int buffer_id,
-                          base::Time timestamp);
+  void DoSendFilledBufferOnIOThread(int device_id,
+                                    int buffer_id,
+                                    base::Time timestamp);
 
   // Send a information about frame resolution and frame rate
   // to the VideoCaptureMessageFilter.
-  void DoSendFrameInfo(int device_id,
-                       int width,
-                       int height,
-                       int frame_per_second);
+  void DoSendFrameInfoOnIOThread(int device_id,
+                                 int width,
+                                 int height,
+                                 int frame_per_second);
 
   // Handle error coming from VideoCaptureDevice.
-  void DoHandleError(int device_id);
+  void DoHandleErrorOnIOThread(int device_id);
 
+  void DoPausedOnIOThread(int device_id);
+
   // Helpers.
   media_stream::VideoCaptureManager* GetVideoCaptureManager();