Add UMA for the new generic permisison class

chrome/browser/content_settings/content_settings_default_provider.cc

Index: chrome/browser/content_settings/content_settings_default_provider.cc
diff --git a/chrome/browser/content_settings/content_settings_default_provider.cc b/chrome/browser/content_settings/content_settings_default_provider.cc
index 8673960f130427c0fe0d65481cb5e8e3ada120cb..c64a076be9bce303326dfa83647980203d92141d 100644
--- a/chrome/browser/content_settings/content_settings_default_provider.cc
+++ b/chrome/browser/content_settings/content_settings_default_provider.cc
@@ -169,8 +169,11 @@ DefaultProvider::DefaultProvider(PrefService* prefs, bool incognito)
       ValueToContentSetting(
           default_settings_[CONTENT_SETTINGS_TYPE_MIDI_SYSEX].get()),
       CONTENT_SETTING_NUM_SETTINGS);
-
-  // TODO(miguelg): Add UMA for Push messaging here
+  UMA_HISTOGRAM_ENUMERATION(
+      "ContentSettings.DefaultPushMessagingSetting",
+      ValueToContentSetting(
+          default_settings_[CONTENT_SETTINGS_TYPE_PUSH_MESSAGING].get()),
+      CONTENT_SETTING_NUM_SETTINGS);
 
   pref_change_registrar_.Init(prefs_);
   PrefChangeRegistrar::NamedChangeCallback callback = base::Bind(