Address bug where the one-click sign-in bar would never show again once

chrome/browser/ui/sync/one_click_signin_helper.cc

Index: chrome/browser/ui/sync/one_click_signin_helper.cc
===================================================================
--- chrome/browser/ui/sync/one_click_signin_helper.cc	(revision 142948)
+++ chrome/browser/ui/sync/one_click_signin_helper.cc	(working copy)
@@ -12,6 +12,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -71,6 +72,10 @@
   // show again in this profile.
   void DisableOneClickSignIn();
 
+  // Add a specific email to the list of emails rejected for one-click
+  // sign-in, for this profile.
+  void AddEmailToOneClickRejectedList(const std::string& email);
+
   // Record the specified action in the histogram for one-click sign in.
   void RecordHistogramAction(int action);
 
@@ -146,6 +151,8 @@
 }  // namespace
 
 bool OneClickLoginInfoBarDelegate::Accept() {
+  // User has accepted one-click sign-in for this account. Never ask again for
+  // this profile.
   DisableOneClickSignIn();
   content::WebContents* web_contents = owner()->web_contents();
   RecordHistogramAction(one_click_signin::HISTOGRAM_ACCEPTED);
@@ -157,7 +164,7 @@
 }
 
 bool OneClickLoginInfoBarDelegate::Cancel() {
-  DisableOneClickSignIn();
+  AddEmailToOneClickRejectedList(email_);
   RecordHistogramAction(one_click_signin::HISTOGRAM_REJECTED);
   button_pressed_ = true;
   return true;
@@ -190,6 +197,16 @@
   pref_service->SetBoolean(prefs::kReverseAutologinEnabled, false);
 }
 
+void OneClickLoginInfoBarDelegate::AddEmailToOneClickRejectedList(
+    const std::string& email) {
+  PrefService* pref_service =
+      TabContents::FromWebContents(owner()->web_contents())->
+          profile()->GetPrefs();
+  ListPrefUpdate updater(pref_service,
+                         prefs::kReverseAutologinRejectedEmailList);
+  updater->AppendIfNotPresent(base::Value::CreateStringValue(email));
+}
+
 void OneClickLoginInfoBarDelegate::RecordHistogramAction(int action) {
   UMA_HISTOGRAM_ENUMERATION("AutoLogin.Reverse", action,
                             one_click_signin::HISTOGRAM_MAX);
@@ -197,6 +214,7 @@
 
 // static
 bool OneClickSigninHelper::CanOffer(content::WebContents* web_contents,
+                                    const std::string& email,
                                     bool check_connected) {
   if (!web_contents)
     return false;
@@ -226,6 +244,19 @@
 
     if (!manager->GetAuthenticatedUsername().empty())
       return false;
+
+    // If email was already rejected by this profile for one-click sign-in.
+    if (!email.empty()) {
+      const ListValue* rejected_emails = profile->GetPrefs()->GetList(
+          prefs::kReverseAutologinRejectedEmailList);
+      if (!rejected_emails->empty()) {
+        const Value* email_value = Value::CreateStringValue(email);
+        ListValue::const_iterator iter = rejected_emails->Find(
+                *email_value);
+        if (iter != rejected_emails->end())
+          return false;
+      }
+    }
   }
 
   return true;
@@ -283,7 +314,7 @@
 
   content::WebContents* web_contents = tab_util::GetWebContentsByID(child_id,
                                                                     route_id);
-  if (!web_contents || !CanOffer(web_contents, true))
+  if (!web_contents || !CanOffer(web_contents, email, true))
     return;
 
   // If some profile, not just the current one, is already connected to this