Created a ACTION_RESTRICT_BACKGROUND_CHANGED intent.

This intent will be broadcasted when:

- Global restrict background setting is changed (sent to all packages)
- An individual uid is added to or removed from the whitelist (sent just
  to the packages belonging to that uid).

This intent is only sent to registered receivers.

BUG: 26451391
Change-Id: Ic0a5771f88baa52076ad04764f29098a386463cc
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 56c3fc8..f6e1b7f 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -233,6 +233,7 @@
     <!-- @deprecated.  Only {@link android.net.ConnectivityManager.CONNECTIVITY_ACTION} is sent. -->
     <protected-broadcast android:name="android.net.conn.CONNECTIVITY_CHANGE_IMMEDIATE" />
     <protected-broadcast android:name="android.net.conn.DATA_ACTIVITY_CHANGE" />
+    <protected-broadcast android:name="android.net.conn.RESTRICT_BACKGROUND_CHANGED" />
     <protected-broadcast android:name="android.net.conn.BACKGROUND_DATA_SETTING_CHANGED" />
     <protected-broadcast android:name="android.net.conn.CAPTIVE_PORTAL_TEST_COMPLETED" />