Added uma for pin unlock set up.

chrome/browser/ui/webui/settings/md_settings_ui.cc

 // Copyright 2015 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/settings/md_settings_ui.h"
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/metrics_handler.h"
 #include "chrome/browser/ui/webui/settings/about_handler.h"
 #include "chrome/browser/ui/webui/settings/appearance_handler.h"
 #include "chrome/browser/ui/webui/settings/browser_lifetime_handler.h"
 #include "chrome/browser/ui/webui/settings/downloads_handler.h"
 #include "chrome/browser/ui/webui/settings/extension_control_handler.h"
 #include "chrome/browser/ui/webui/settings/font_handler.h"
 #include "chrome/browser/ui/webui/settings/languages_handler.h"
 #include "chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.h"
 #include "chrome/browser/ui/webui/settings/metrics_reporting_handler.h"
 #include "chrome/browser/ui/webui/settings/on_startup_handler.h"
@@ skipping 110 matching lines @@
       chromeos::settings::DateTimeHandler::Create(html_source));
 
   html_source->AddBoolean("stylusAllowed", ash::IsPaletteFeatureEnabled());
   html_source->AddBoolean("pinUnlockEnabled",
                           chromeos::IsPinUnlockEnabled(profile->GetPrefs()));
 #endif
 
   AddSettingsPageUIHandler(AboutHandler::Create(html_source, profile));
   AddSettingsPageUIHandler(ResetSettingsHandler::Create(html_source, profile));
 
+  // Add the metrics handler to write uma stats.
+  web_ui->AddMessageHandler(new MetricsHandler());
+
   // Add all settings resources.
   for (size_t i = 0; i < kSettingsResourcesSize; ++i) {
     html_source->AddResourcePath(kSettingsResources[i].name,
                                  kSettingsResources[i].value);
   }
 
   AddLocalizedStrings(html_source, profile);
   html_source->SetDefaultResource(IDR_SETTINGS_SETTINGS_HTML);
 
   content::WebUIDataSource::Add(web_ui->GetWebContents()->GetBrowserContext(),
@@ skipping 22 matching lines @@
   UMA_HISTOGRAM_TIMES("Settings.LoadDocumentTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 void MdSettingsUI::DocumentOnLoadCompletedInMainFrame() {
   UMA_HISTOGRAM_TIMES("Settings.LoadCompletedTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 }  // namespace settings