Add histogram for pages to open enum on session restore.

chrome/browser/prefs/pref_metrics_service.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/prefs/pref_metrics_service.h"
 
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 
 PrefMetricsService::PrefMetricsService(Profile* profile)
     : profile_(profile) {
   RecordLaunchPrefs();
 }
 
 PrefMetricsService::~PrefMetricsService() {
 }
 
+class StartupPagePref {

[bbudge, 2013/07/27 10:49:06]

Why not just declare an enum named StartupPagePref or StartupPageType?

[meacer, 2013/07/30 00:37:55]

Done.

+ public:
+  enum Type {
+    NONE = 0,
+    HOMEPAGE = 1,
+    NEWTAB = 2,
+    LAST = 3,
+    NO_URL = 4,

[bbudge, 2013/07/27 10:49:06]

ZERO_URLS ?

[meacer, 2013/07/30 00:37:55]

Done.

+    ONE_URL = 5,
+    MULTIPLE_URLS = 6,
+    TYPE_COUNT = 7
+  };
+};
+
+StartupPagePref::Type GetStartupPagePref(Profile* profile) {
+  int restore_on_startup =
+      profile->GetPrefs()->GetInteger(prefs::kRestoreOnStartup);
+  int url_list_size = 0;
+  switch (restore_on_startup) {
+    case SessionStartupPref::kPrefValueHomePage:
+      return StartupPagePref::HOMEPAGE;
+    case SessionStartupPref::kPrefValueLast:
+      return StartupPagePref::LAST;
+    case SessionStartupPref::kPrefValueNewTab:
+      return StartupPagePref::NEWTAB;
+    case SessionStartupPref::kPrefValueURLs:
+      url_list_size = profile->GetPrefs()->GetList(
+          prefs::kURLsToRestoreOnStartup)->GetSize();
+      if (url_list_size == 0) {
+        return StartupPagePref::NO_URL;
+      } else if (url_list_size == 1) {
+        return StartupPagePref::ONE_URL;
+      } else {
+        return StartupPagePref::MULTIPLE_URLS;
+      }
+    default:
+      return StartupPagePref::NONE;
+  }
+}
+
 void PrefMetricsService::RecordLaunchPrefs() {
   UMA_HISTOGRAM_BOOLEAN("Settings.ShowHomeButton",
       profile_->GetPrefs()->GetBoolean(prefs::kShowHomeButton));
   UMA_HISTOGRAM_BOOLEAN("Settings.HomePageIsNewTabPage",
       profile_->GetPrefs()->GetBoolean(prefs::kHomePageIsNewTabPage));
+  UMA_HISTOGRAM_ENUMERATION("Settings.SessionRestoreOnStartup",
+      GetStartupPagePref(profile_), StartupPagePref::TYPE_COUNT);
 }
 
 // static
 PrefMetricsService::Factory* PrefMetricsService::Factory::GetInstance() {
   return Singleton<PrefMetricsService::Factory>::get();
 }
 
 // static
 PrefMetricsService* PrefMetricsService::Factory::GetForProfile(
     Profile* profile) {
@@ skipping 21 matching lines @@
 }
 
 bool PrefMetricsService::Factory::ServiceIsNULLWhileTesting() const {
   return false;
 }
 
 content::BrowserContext* PrefMetricsService::Factory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }