Add emergency assistance API and setting

Bug: 19841649
Change-Id: I5bc99df6d85eb84b253456e32ce52afd7592a95e
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index de536bd..fb51528 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5255,6 +5255,15 @@
         public static final String SMS_DEFAULT_APPLICATION = "sms_default_application";
 
         /**
+         * Specifies the package name currently configured to be the emergency assistance application
+         *
+         * @see android.telephony.TelephonyManager#ACTION_EMERGENCY_ASSISTANCE
+         *
+         * @hide
+         */
+        public static final String EMERGENCY_ASSISTANCE_APPLICATION = "emergency_assistance_application";
+
+        /**
          * Names of the packages that the current user has explicitly allowed to
          * see all of the user's notifications, separated by ':'.
          *