Store rotation/ui scale to local state.

ash/display/display_controller.h

Index: ash/display/display_controller.h
diff --git a/ash/display/display_controller.h b/ash/display/display_controller.h
index 051704cd40f1affd58205b39273741f14578a978..bf3f41a6ac384bf44873697be328ba244ec6b926 100644
--- a/ash/display/display_controller.h
+++ b/ash/display/display_controller.h
@@ -94,6 +94,7 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver {
   DisplayController();
   virtual ~DisplayController();
 
+  void Start();
   void Shutdown();
 
   // Returns primary display. This is safe to use after ash::Shell is
@@ -166,6 +167,7 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver {
   void RegisterLayoutForDisplayIdPair(int64 id1,
                                       int64 id2,
                                       const DisplayLayout& layout);
+  // OBSOLETE

[James Cook, 2013/03/22 16:53:14]

Did you mean to keep this?  Should it be a TODO(oshima): Remove this after ....

[oshima, 2013/03/22 18:20:42]

Done.

   void RegisterLayoutForDisplayId(int64 id, const DisplayLayout& layout);
 
   // Sets the layout for the current display pair. The |layout| specifies