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

chrome/browser/signin/signin_promo.cc

Index: chrome/browser/signin/signin_promo.cc
diff --git a/chrome/browser/signin/signin_promo.cc b/chrome/browser/signin/signin_promo.cc
index 0f0c1e0ddaec0b6c4dc0b8b0c76adcfae9c82ca2..0445117d0554b342eae4cfc7431441217655acb7 100644
--- a/chrome/browser/signin/signin_promo.cc
+++ b/chrome/browser/signin/signin_promo.cc
@@ -195,14 +195,22 @@ GURL GetReauthURL(Profile* profile, const std::string& account_id) {
   AccountTrackerService::AccountInfo info =
       AccountTrackerServiceFactory::GetForProfile(profile)->
           GetAccountInfo(account_id);
+  return GetReauthURL(std::string::npos, info.email);
+}
 
+GURL GetReauthURL(size_t profile_index, const std::string& email) {
   signin_metrics::Source source = switches::IsNewAvatarMenu() ?
       signin_metrics::SOURCE_REAUTH : signin_metrics::SOURCE_SETTINGS;
 
   GURL url = signin::GetPromoURL(
       source, true /* auto_close */,
       switches::IsNewAvatarMenu() /* is_constrained */);
-  url = net::AppendQueryParameter(url, "email", info.email);
+
+  if (profile_index != std::string::npos)
+    url = net::AppendQueryParameter(url, kSignInPromoQueryKeyProfileIndex,
+                                    base::SizeTToString(profile_index));
+
+  url = net::AppendQueryParameter(url, "email", email);
   url = net::AppendQueryParameter(url, "validateEmail", "1");
   return net::AppendQueryParameter(url, "readOnlyEmail", "1");
 }
@@ -218,6 +226,18 @@ GURL GetNextPageURLForPromoURL(const GURL& url) {
   return GURL();
 }
 
+size_t GetProfileIndexForPromoURL(const GURL& url) {
+  size_t index = std::string::npos;
+  std::string value;
+  if (net::GetValueForKeyInQuery(url, kSignInPromoQueryKeyProfileIndex,
+                                 &value) &&
+      base::StringToSizeT(value, &index)) {
+    return index;
+  }
+
+  return std::string::npos;
+}
+
 GURL GetSigninPartitionURL() {
   return GURL("chrome-guest://chrome-signin/?");
 }