Merge "Expose taskbar toggled signal to Launcher" into udc-dev

quickstep/src/com/android/quickstep/TouchInteractionService.java

@@ -189,6 +189,12 @@ public class TouchInteractionService extends Service
             sIsInitialized = true;
         }
 
+        @BinderThread
+        @Override
+        public void onTaskbarToggled() {
+            // To be implemented.
+        }
+
         @BinderThread
         public void onOverviewToggle() {
             TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onOverviewToggle");