Make sure to display an errors that occur during the chrome sign in process

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 9b8d6b591ffe31ab3e8e0e5d42bc9f682c1e6b1a..76b2032760b7c380d12cf978d1fe6d939ec66afa 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1724,6 +1724,10 @@ const char kSyncPromoShowOnFirstRunAllowed[] =
 // Boolean that specifies if we should show a bubble in the new tab page.
 // The bubble is used to confirm that the user is signed into sync.
 const char kSyncPromoShowNTPBubble[] = "sync_promo.show_ntp_bubble";
+
+// An error to show in the sync promo bubble, if needed.  If the sign in was
+// successful, this property holds an empty string.
+const char kSyncPromoErrorMessage[] = "sync_promo.error_message";
 #endif
 
 // Time when the user's GAIA info was last updated (represented as an int64).