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

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index e5dd42afa20549ee29afd3abf64aa8d104629dda..180c7c631f5dc937c07d511c7a7749cd05805881 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -19,6 +19,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "chrome/browser/media/media_capture_devices_dispatcher.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/window.h"
 #include "ui/base/ui_base_types.h"
@@ -162,7 +163,8 @@ class ShellTestApi;
 class ASH_EXPORT Shell
     : public internal::SystemModalContainerEventFilterDelegate,
       public ui::EventTarget,
-      public aura::client::ActivationChangeObserver {
+      public aura::client::ActivationChangeObserver,
+      public MediaCaptureDevicesDispatcher::Observer {
  public:
   typedef std::vector<internal::RootWindowController*> RootWindowControllerList;
 
@@ -571,6 +573,12 @@ class ASH_EXPORT Shell
   virtual void OnWindowActivated(aura::Window* gained_active,
                                  aura::Window* lost_active) OVERRIDE;
 
+  // Overridden from MediaCaptureDevicesDispatcher::Observer:
+  virtual void OnRequestUpdate(int render_process_id,
+                               int render_view_id,
+                               const content::MediaStreamDevice& device,
+                               const content::MediaRequestState state) OVERRIDE;
+
   static Shell* instance_;
 
   // If set before the Shell is initialized, the mouse cursor will be hidden