Tell each VM to flush their DNS cache.

bug:3095357
Change-Id: I93de24e3e5a7d8b94d55f4facfffc863a2b8c202
diff --git a/core/java/android/app/IApplicationThread.java b/core/java/android/app/IApplicationThread.java
index 1f8a7c58..830c702 100644
--- a/core/java/android/app/IApplicationThread.java
+++ b/core/java/android/app/IApplicationThread.java
@@ -87,6 +87,7 @@
     void requestThumbnail(IBinder token) throws RemoteException;
     void scheduleConfigurationChanged(Configuration config) throws RemoteException;
     void updateTimeZone() throws RemoteException;
+    void clearDnsCache() throws RemoteException;
     void processInBackground() throws RemoteException;
     void dumpService(FileDescriptor fd, IBinder servicetoken, String[] args)
             throws RemoteException;
@@ -146,4 +147,5 @@
     int SCHEDULE_CRASH_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+34;
     int DUMP_HEAP_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+35;
     int DUMP_ACTIVITY_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+36;
+    int CLEAR_DNS_CACHE_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION+37;
 }