Call initTransitionEndpoints in constructor

Before, the soonest we initTransitionEndpoints() is in
onRecentsAnimationStart(), which might be too late if launcher was
killed. (In that case, the gesture might end before we ever get
onRecentsAnimationStart(), and thus will never consider the distance
traveled great enough to trigger recents since we don't have endpoints.)

Bug: 129723135
Change-Id: I349f62244aaba8369926b14f90acd994fd40a93a

quickstep/recents_ui_overrides/src/com/android/quickstep/WindowTransformSwipeHandler.java

@@ -276,6 +276,9 @@ public class WindowTransformSwipeHandler<T extends BaseDraggingActivity>
 
         mMode = SysUINavigationMode.getMode(context);
         initStateCallbacks();
+
+        DeviceProfile dp = InvariantDeviceProfile.INSTANCE.get(mContext).getDeviceProfile(mContext);
+        initTransitionEndpoints(dp);
     }
 
     private void initStateCallbacks() {