ApplicationThread: Check interface before invoking scheduleLowMemory

Change-Id: I51317386e1729366d19f7e3a1747b05170b9305a

Author: Ethan1983

core/java/android/app/ApplicationThreadNative.java

@@ -369,6 +369,7 @@ public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
 
         case SCHEDULE_LOW_MEMORY_TRANSACTION:
         {
+            data.enforceInterface(IApplicationThread.descriptor);
             scheduleLowMemory();
             return true;
         }