Store rotation/ui scale to local state.

ash/display/display_change_observer_x11.cc

Index: ash/display/display_change_observer_x11.cc
diff --git a/ash/display/display_change_observer_x11.cc b/ash/display/display_change_observer_x11.cc
index c7539a3a2e60752d8b379ac608ca54b5aa2df1f2..9af77395929af2db91798c0c9a59577bc89acaf8 100644
--- a/ash/display/display_change_observer_x11.cc
+++ b/ash/display/display_change_observer_x11.cc
@@ -15,6 +15,7 @@
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "base/message_pump_aurax11.h"
+#include "ash/display/display_controller.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/x/x11_util.h"
@@ -128,6 +129,17 @@ DisplayChangeObserverX11::DisplayChangeObserverX11()
 DisplayChangeObserverX11::~DisplayChangeObserverX11() {
 }
 
+chromeos::OutputState DisplayChangeObserverX11::GetStateForOutputs(
+    const std::vector<RROutput>& outputs) const {
+  CHECK(outputs.size() == 2);
+  DisplayIdPair pair = std::make_pair(GetDisplayId(outputs[0], 0),
+                                      GetDisplayId(outputs[1], 1));
+  DisplayLayout layout = Shell::GetInstance()->display_controller()->
+      GetRegisteredDisplayLayout(pair);
+  return layout.mirrored ?
+      chromeos::STATE_DUAL_MIRROR : chromeos::STATE_DUAL_EXTENDED;
+}
+
 void DisplayChangeObserverX11::OnDisplayModeChanged() {
   XRRScreenResources* screen_resources =
       XRRGetScreenResources(xdisplay_, x_root_window_);