Chrome OS: avoid suspending on lid close when casting is active.

chrome/browser/media/media_capture_devices_dispatcher.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 "chrome/browser/media/media_capture_devices_dispatcher.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ skipping 737 matching lines @@
           queue.erase(it);
           found = true;
           break;
         }
       }
       if (found)
         break;
     }
   }
 
+#if defined(OS_CHROMEOS)
+  // Notify ash that screen sharing state has changed.
+  if (device.type == content::MEDIA_TAB_VIDEO_CAPTURE ||
+      device.type == content::MEDIA_DESKTOP_VIDEO_CAPTURE) {
+    if (state == content::MEDIA_REQUEST_STATE_DONE) {
+      ash::Shell::GetInstance()->OnScreenSharingStateChanged(true);

[Sergey Ulanov, 2014/01/15 22:23:45]

can ash::Shell register itself as an observer?

[Daniel Erat, 2014/01/15 22:42:59]

like haixia said, this would only be possible if this code e.g. lived in
content/ instead of chrome/

+    } else if (state == content::MEDIA_REQUEST_STATE_CLOSING) {
+      ash::Shell::GetInstance()->OnScreenSharingStateChanged(false);
+    }
+  }
+#endif
+
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnRequestUpdate(render_process_id,
                                     render_view_id,
                                     device,
                                     state));
 }
 
 void MediaCaptureDevicesDispatcher::OnCreatingAudioStreamOnUIThread(
     int render_process_id,
     int render_view_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnCreatingAudioStream(render_process_id, render_view_id));
 }
 
 bool MediaCaptureDevicesDispatcher::IsDesktopCaptureInProgress() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return desktop_capture_sessions_.size() > 0;
 }