Sync Promo: Remember promo expanded state

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 126d0cec8e9d76d39f0fe21d3d14407189645389..573c73594c94fa27532080fee32516be8b1356a0 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -40,6 +40,10 @@ const char kRestoreOnStartup[] = "session.restore_on_startup";
 // are only restored on startup if kRestoreOnStartup is 4.
 const char kURLsToRestoreOnStartup[] = "session.urls_to_restore_on_startup";
 
+// A bool pref to used to determine if the sync promo should be expanded or
+// collapsed.
+const char kSyncPromoExpanded[] = "profile.sync_promo_expanded";
+
 // The application locale.
 // For OS_CHROMEOS we maintain kApplicationLocale property in both local state
 // and user's profile.  Global property determines locale of login screen,