Store rotation/ui scale to local state.

ash/display/display_manager.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 "ash/display/display_manager.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 320 matching lines @@
       internal_display_info_->SetBounds(gfx::Rect(0, 0, 800, 600));
     }
     new_display_info_list.push_back(*internal_display_info_.get());
     // An internal display is always considered *connected*.
     num_connected_displays_++;
   }
   UpdateDisplays(new_display_info_list);
 }
 
 void DisplayManager::UpdateDisplays() {
+#if defined(OS_CHROMEOS)
+  if (displays_.size() > 0 && base::chromeos::IsRunningOnChromeOS()) {
+    const DisplayLayout& layout = Shell::GetInstance()->
+        display_controller()->GetCurrentDisplayLayout();
+    if (layout.mirrored) {
+      Shell::GetInstance()->output_configurator()->
+          SetDisplayMode(chromeos::STATE_DUAL_MIRROR);
+    }
+    return;
+  }
+#endif
   DisplayInfoList display_info_list;
   for (DisplayList::const_iterator iter = displays_.begin();
        iter != displays_.end(); ++iter) {
     display_info_list.push_back(GetDisplayInfo(iter->id()));
   }
   UpdateDisplays(display_info_list);
 }
 
 void DisplayManager::UpdateDisplays(
     const std::vector<DisplayInfo>& updated_display_info_list) {
@@ skipping 369 matching lines @@
   // always (0,0) and the secondary display's bounds will be updated
   // by |DisplayController::UpdateDisplayBoundsForLayout|.
   new_display.SetScaleAndBounds(
       display_info.device_scale_factor(), gfx::Rect(bounds_in_pixel.size()));
   new_display.set_rotation(display_info.rotation());
   return new_display;
 }
 
 }  // namespace internal
 }  // namespace ash