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..56f722481b4016d565511e56dcf70fd641e27a43 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 GetReauthURL(size_t profile_index, const std::string& email);

[bcwhite, 2015/07/21 13:28:39]

These two methods are keyed based on the second parameter (email vs account-id)
but are differentiated by the compiler based solely on the first parameter.

I suggest different names for these methods and have the first parameters be the
same.

[Roger Tawa OOO till Jul 10th, 2015/07/22 00:12:32]

Renamed new method.  I don't want to change the signature of the existing
GetReauthURL() function since it is used in lots of places not related to this
CL.  So I'll keep the args as is.

+
 // 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();