chromeos: Add separate screen dim/off delays for lock screen

chrome/browser/chromeos/power/power_prefs.h

Index: chrome/browser/chromeos/power/power_prefs.h
diff --git a/chrome/browser/chromeos/power/power_prefs.h b/chrome/browser/chromeos/power/power_prefs.h
index 1e037cee894927faee85d365ed635063eaddb169..a0830889df99d9aef829eeea8ae85f4a56a5916c 100644
--- a/chrome/browser/chromeos/power/power_prefs.h
+++ b/chrome/browser/chromeos/power/power_prefs.h
@@ -60,6 +60,9 @@ class PowerPrefs : public content::NotificationObserver {
   Profile* profile_;  // Not owned.
   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
 
+  // True while the screen is locked (but not while the login screen is shown).
+  bool screen_is_locked_;
+
   DISALLOW_COPY_AND_ASSIGN(PowerPrefs);
 };