Settings: External automatic rule settings.

 - Add external automatic rule settings page with the common
   settings for all rules (enabled, name, zen mode).
 - Pull common rule-instance settings into settings base class, share
   with existing schedule rule settings.
 - New page not searchable since it is at the rule-instance level.
 - Obtain external rule information from existing conditions provider
   metadata.  Includes rule type caption, sub-configuration activity,
   and default condition id.
 - If external condition providers exist with the appropriate metadata,
   display the external rule types as options in the new rule dialog.
   (max of 3 external types)
 - Pull common managed service listing code out of common settings base
   class and into a more reusable helper class.

Bug: 20064962
Change-Id: Ibc13607490b7312a7d9f7f3bd61c3cfcf71a2794
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index fe0df59..ba08036 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -98,6 +98,7 @@
     public static class ZenModePrioritySettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeAutomationSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeScheduleRuleSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class ZenModeExternalRuleSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationAppListActivity extends SettingsActivity { /* empty */ }
     public static class AppNotificationSettingsActivity extends SettingsActivity { /* empty */ }