Add UMA for signin through NTP content suggestions.

chrome/browser/ui/webui/signin/inline_login_handler.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/signin/inline_login_handler.h"
 
 #include <limits.h>
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 159 matching lines @@
           base::UserMetricsAction("Signin_Signin_FromUnknownAccessPoint"));
       break;
     case signin_metrics::AccessPoint::ACCESS_POINT_PASSWORD_BUBBLE:
       content::RecordAction(
           base::UserMetricsAction("Signin_Signin_FromPasswordBubble"));
       break;
     case signin_metrics::AccessPoint::ACCESS_POINT_AUTOFILL_DROPDOWN:
       content::RecordAction(
           base::UserMetricsAction("Signin_Signin_FromAutofillDropdown"));
       break;
+    case signin_metrics::AccessPoint::ACCESS_POINT_NTP_CONTENT_SUGGESTIONS:
+      content::RecordAction(
+          base::UserMetricsAction("Signin_Signin_FromNTPContentSuggestions"));
+      break;
     case signin_metrics::AccessPoint::ACCESS_POINT_MAX:
       NOTREACHED();
       break;
   }
 }
 
 void InlineLoginHandler::ContinueHandleInitializeMessage() {
   base::DictionaryValue params;
 
   const std::string& app_locale = g_browser_process->GetApplicationLocale();
@@ skipping 101 matching lines @@
 
 void InlineLoginHandler::HandleDialogClose(const base::ListValue* args) {
   Browser* browser = GetDesktopBrowser(web_ui());
   // If the dialog was opened in the User Manager browser will be null here.
   if (browser)
     browser->CloseModalSigninWindow();
 
   // Does nothing if user manager is not showing.
   UserManager::HideReauthDialog();
 }