Lock rotation when screen is manually rotated.

chrome/browser/chromeos/display/display_preferences.cc

Index: chrome/browser/chromeos/display/display_preferences.cc
diff --git a/chrome/browser/chromeos/display/display_preferences.cc b/chrome/browser/chromeos/display/display_preferences.cc
index 7055eec03b1d98b6860233c5fd8ceba4ab01bca4..4f62e781b633b3e1286d107ff6ac26b2fd3c2525 100644
--- a/chrome/browser/chromeos/display/display_preferences.cc
+++ b/chrome/browser/chromeos/display/display_preferences.cc
@@ -9,6 +9,7 @@
 #include "ash/display/display_pref_util.h"
 #include "ash/display/resolution_notification_controller.h"
 #include "ash/shell.h"
+#include "ash/wm/maximize_mode/maximize_mode_controller.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ -309,6 +310,10 @@ void StoreDisplayPrefs() {
           DoesNotificationTimeout()) {
     return;
   }
+
+  if (!ash::Shell::GetInstance()->ShouldSaveDisplaySettings())

[oshima, 2014/05/23 19:15:05]

Sorry if it wasn't clear. I wanted something like

if (!UserCanSaveDisplayPreferene() ||
    !ash::Shell::GetInstance()->ShouldSaveDisplaySettings()) {
  return;
}

and remove the dependency to resolution_notification_controller and
maximize_mode_contoroller from this class.

[jonross, 2014/05/23 19:52:14]

Done.

+    return;
+
   StoreCurrentDisplayLayoutPrefs();
   StoreCurrentDisplayProperties();
 }