Checking can start system gesture before creation of TaskbarStashInputConsumer, so that taskbar does not show up  when user performs swipe up from lock screen or notification panel.

Test: visual(video in buganizer)

Fix:261524189, 262589756

Change-Id: I5252281025953753f9184f1b19c534513b5800fa
diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index 5d17cc7..08a0ab3 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -800,7 +800,7 @@
 
             // If Taskbar is present, we listen for long press to unstash it.
             TaskbarActivityContext tac = mTaskbarManager.getCurrentActivityContext();
-            if (tac != null) {
+            if (tac != null && canStartSystemGesture) {
                 reasonString.append(NEWLINE_PREFIX)
                         .append(reasonPrefix)
                         .append(SUBSTRING_PREFIX)