Clear command queue of OverviewCommandHelper on home tap

Fixes: 194934483
Test: manual
Change-Id: Id83b341245793c38c305e6ada5581ac4e49527a7

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

@@ -297,6 +297,10 @@ public class TouchInteractionService extends Service implements PluginListener<O
         public TaskbarManager getTaskbarManager() {
             return mTaskbarManager;
         }
+
+        public OverviewCommandHelper getOverviewCommandHelper() {
+            return mOverviewCommandHelper;
+        }
     }
 
     private static boolean sConnected = false;