Add missing break statement.

It was caught in the code review after the merge (thanks Narayan!).
This is already fixed and tested in the internal branch (see Merged-In)

Test: manual, CTS in internal

Change-Id: I9f6f72995e9ab633564b6bc22846fbe99eb65105
Merged-In: If14126e645b2d0a1307404e2f50088b3994abce2

core/java/android/app/ActivityThread.java

@@ -1724,6 +1724,7 @@ public final class ActivityThread {
                 case LOCAL_VOICE_INTERACTION_STARTED:
                     handleLocalVoiceInteractionStarted((IBinder) ((SomeArgs) msg.obj).arg1,
                             (IVoiceInteractor) ((SomeArgs) msg.obj).arg2);
+                    break;
                 case ATTACH_AGENT:
                     handleAttachAgent((String) msg.obj);
                     break;