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

content/browser/renderer_host/media/video_capture_controller.cc

 // 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.
 
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
@@ skipping 197 matching lines @@
 
 void VideoCaptureController::StopSession(
     int session_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DVLOG(1) << "VideoCaptureController::StopSession, id " << session_id;
 
   ControllerClient* client = FindClient(session_id, pending_clients_);
   if (!client)
     client = FindClient(session_id, controller_clients_);
 
-  if (client)
+  if (client) {
     client->session_closed = true;
+    client->event_handler->OnPaused(client->controller_id);

[Ronghua Wu (Left Chromium), 2012/05/17 22:54:37]

Should we call this be called OnStop?

[wjia(left Chromium), 2012/05/23 18:46:48]

|Stop| has been used StopCapture. |Pause| is used here to indicate that the
session has been stopped, and there is no frame sent out by
VideoCaptureController any more.

+  }
 }
 
 void VideoCaptureController::ReturnBuffer(
     const VideoCaptureControllerID& id,
     VideoCaptureControllerEventHandler* event_handler,
     int buffer_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   ControllerClient* client = FindClient(id, event_handler,
                                         controller_clients_);
@@ skipping 350 matching lines @@
 bool VideoCaptureController::ClientHasDIB() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   base::AutoLock lock(lock_);
   for (DIBMap::iterator dib_it = owned_dibs_.begin();
        dib_it != owned_dibs_.end(); dib_it++) {
     if (dib_it->second->references > 0)
       return true;
   }
   return false;
 }