add call back intents for clearing missed calls and calling back.

Change-Id: Ib81fecc21c5491f975fa7c44f4e5984a4b3f8e7f
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index 232bf0f..8779462 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -393,6 +393,22 @@
             "android.telecom.extra.NOTIFICATION_PHONE_NUMBER";
 
     /**
+     * The intent to clear missed calls.
+     * @hide
+     */
+    @SystemApi
+    public static final String EXTRA_CLEAR_MISSED_CALLS_INTENT =
+            "android.telecom.extra.CLEAR_MISSED_CALLS_INTENT";
+
+    /**
+     * The intent to call back a missed call.
+     * @hide
+     */
+    @SystemApi
+    public static final String EXTRA_CALL_BACK_INTENT =
+            "android.telecom.extra.CALL_BACK_INTENT";
+
+    /**
      * The following 4 constants define how properties such as phone numbers and names are
      * displayed to the user.
      */