Add histogram for pages to open enum on session restore.

chrome/browser/prefs/pref_metrics_service.cc

Index: chrome/browser/prefs/pref_metrics_service.cc
diff --git a/chrome/browser/prefs/pref_metrics_service.cc b/chrome/browser/prefs/pref_metrics_service.cc
index ed1d5380e5849a2e828a2951ac73b4e25d494df8..79ae92e4ceb7665aa10badf06a7f638091bfa5ab 100644
--- a/chrome/browser/prefs/pref_metrics_service.cc
+++ b/chrome/browser/prefs/pref_metrics_service.cc
@@ -6,6 +6,7 @@
 
 #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"
@@ -19,11 +20,50 @@ PrefMetricsService::PrefMetricsService(Profile* profile)
 PrefMetricsService::~PrefMetricsService() {
 }
 
+enum StartupPagePref {

[bbudge, 2013/12/04 20:05:09]

Also, since it's private to this file, could this be defined in an anonymous
namespace above?

+  NONE = 0,
+  HOMEPAGE = 1,
+  NEWTAB = 2,
+  LAST = 3,
+  ZERO_URLS = 4,
+  ONE_URL = 5,
+  MULTIPLE_URLS = 6,
+  TYPE_COUNT = 7
+};
+
+StartupPagePref 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 HOMEPAGE;
+    case SessionStartupPref::kPrefValueLast:
+      return LAST;
+    case SessionStartupPref::kPrefValueNewTab:
+      return NEWTAB;
+    case SessionStartupPref::kPrefValueURLs:
+      url_list_size = profile->GetPrefs()->GetList(
+          prefs::kURLsToRestoreOnStartup)->GetSize();
+      if (url_list_size == 0) {
+        return ZERO_URLS;
+      } else if (url_list_size == 1) {
+        return ONE_URL;
+      } else {
+        return MULTIPLE_URLS;
+      }
+    default:
+      return 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_), TYPE_COUNT);
 }
 
 // static