Introduce condition provider services.

Add the condition provider interface, base class, and associated
system metadata.

Pull out common service management code into a reusable helper,
used by notification listeners and condition providers. The
helper, ManagedServices, is now completely self-contained - it
has no dependencies on NoMan or NoMan abstractions.

Bug:13743109
Change-Id: I6856d40f0a2ead78ac9b5707568559a57e7eb009
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 7f9f862..f6d9e84 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -723,6 +723,13 @@
             = "android.settings.NOTIFICATION_LISTENER_SETTINGS";
 
     /**
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String ACTION_CONDITION_PROVIDER_SETTINGS
+            = "android.settings.ACTION_CONDITION_PROVIDER_SETTINGS";
+
+    /**
      * Activity Action: Show settings for video captioning.
      * <p>
      * In some cases, a matching Activity may not exist, so ensure you safeguard
@@ -4510,6 +4517,11 @@
          */
         public static final String ENABLED_NOTIFICATION_LISTENERS = "enabled_notification_listeners";
 
+        /**
+         * @hide
+         */
+        public static final String ENABLED_CONDITION_PROVIDERS = "enabled_condition_providers";
+
         /** @hide */
         public static final String BAR_SERVICE_COMPONENT = "bar_service_component";