Throttling framework addins

Add ThrottleManager in getSystemService
Add API for URL fetch

Bug: 2576057
Change-Id: Icd25c8b91ea4beea15c74e8ad7292ab48c962253
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index eb14815..e640005 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -3333,6 +3333,13 @@
         public static final String THROTTLE_IFACE = "throttle_iface";
 
         /**
+         * Help URI for data throttling policy
+         * @hide
+         */
+        public static final String THROTTLE_HELP_URI = "throttle_help_uri";
+
+
+        /**
          * @hide
          */
         public static final String[] SETTINGS_TO_BACKUP = {