Perform online reauth when password is changed for a locked profile.

chrome/browser/signin/signin_promo.h

Index: chrome/browser/signin/signin_promo.h
diff --git a/chrome/browser/signin/signin_promo.h b/chrome/browser/signin/signin_promo.h
index 055af1c05941aa2b612df70faaf2ac8abde8ff94..a0099aca84f2c5e44f835cc5160f2b40a91fa9f1 100644
--- a/chrome/browser/signin/signin_promo.h
+++ b/chrome/browser/signin/signin_promo.h
@@ -22,6 +22,7 @@ namespace signin {
 
 const char kSignInPromoQueryKeyAutoClose[] = "auto_close";
 const char kSignInPromoQueryKeyContinue[] = "continue";
+const char kSignInPromoQueryKeyProfileIndex[] = "pi";
 const char kSignInPromoQueryKeySource[] = "source";
 const char kSignInPromoQueryKeyConstrained[] = "constrained";
 const char kSignInPromoQueryKeyShowAccountManagement[] =
@@ -58,9 +59,19 @@ GURL GetPromoURL(signin_metrics::Source source,
 // Returns a sign in promo URL specifically for reauthenticating |account_id|.
 GURL GetReauthURL(Profile* profile, const std::string& account_id);
 
+// Returns a sign in promo URL specifically for reauthenticating |email|.
+// |profile_index| indicates the profile being reauth in the URL, which can
+// be extracted via GetProfileIndexForPromoURL().  Use std::string::npos to
+// not specify an index.
+GURL GetReauthURLWithEmail(size_t profile_index, const std::string& email);
+
 // Gets the next page URL from the query portion of the sign in promo URL.
 GURL GetNextPageURLForPromoURL(const GURL& url);
 
+// Gets the profile index encoded in the URL.  Returns std::string::npos if
+// none exsts.
+size_t GetProfileIndexForPromoURL(const GURL& url);
+
 // Gets the partition URL for the embedded sign in frame/webview.
 GURL GetSigninPartitionURL();