mash: Partially migrate ScreenOrientationController to ash/common.

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index ade5c2cd3c718ae72f94f44b718df266a7af5e1f..412772bc6255f09bd981284a52aa95c028aa6acc 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -718,6 +718,12 @@ void WmWindowAura::OnWindowVisibilityChanging(aura::Window* window,
                     OnWindowVisibilityChanging(this, visible));
 }
 
+void WmWindowAura::OnWindowVisibilityChanged(aura::Window* window,
+                                             bool visible) {
+  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
+                    OnWindowVisibilityChanged(this, visible));
+}
+
 void WmWindowAura::OnWindowTitleChanged(aura::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowTitleChanged(this));
 }