Store rotation/ui scale to local state.

chrome/browser/chromeos/display/overscan_calibrator.h

Index: chrome/browser/chromeos/display/overscan_calibrator.h
diff --git a/chrome/browser/chromeos/display/overscan_calibrator.h b/chrome/browser/chromeos/display/overscan_calibrator.h
index cc03b78e8739806a0322f3a8df7e9b5464a804dc..f879098818d6ada4c2d922203e4c5321606d7288 100644
--- a/chrome/browser/chromeos/display/overscan_calibrator.h
+++ b/chrome/browser/chromeos/display/overscan_calibrator.h
@@ -29,6 +29,11 @@ class OverscanCalibrator : public ui::LayerDelegate {
   // Commits the current insets data to the system.
   void Commit();
 
+  // Reset the overscan insets to default value.  If the display has
+  // overscan, the default value is the display's default overscan
+  // value. Otherwise, the default value is the old |initial_insets|.
+  void Reset();
+
   // Updates the insets and redraw the visual feedback.
   void UpdateInsets(const gfx::Insets& insets);
 
@@ -49,6 +54,9 @@ class OverscanCalibrator : public ui::LayerDelegate {
   // The insets initially given. Stored so we can undo the insets later.
   gfx::Insets initial_insets_;
 
+  // The insets claimed by the display.
+  gfx::Insets native_insets_;
+
   // Whether the current insets are committed to the system or not.
   bool committed_;