Implement ScreenOrientationDelegate on ChromeOS

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 9e6e046ccefe55dad3ac68dbff0b82e6b2bbf7b8..cf682218af7a25bf733d83347803bd9d0c5fa5b7 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -118,6 +118,7 @@ class ResolutionNotificationController;
 class RootWindowController;
 class ScopedTargetRootWindow;
 class ScreenAsh;
+class ScreenOrientationDelegate;
 class ScreenPositionController;
 class SessionStateDelegate;
 class Shelf;
@@ -729,6 +730,9 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
   // Listens for output changes and updates the display manager.
   scoped_ptr<DisplayChangeObserver> display_change_observer_;
 
+  // Implements content::ScreenOrientationDelegate for ChromeOS
+  scoped_ptr<ScreenOrientationDelegate> screen_orientation_delegate_;
+
 #if defined(USE_X11)
   scoped_ptr<ui::EventHandler> magnifier_key_scroll_handler_;
   scoped_ptr<ui::EventHandler> speech_feedback_handler_;