gesture: Make sure a combination of sync/async touch-events work correctly.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index d78600dfabce5a215b975018e183378522868696..8d3810b9ca6c2671167fd551f9e032cca8e76c52 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -891,8 +891,10 @@ bool RootWindow::OnHostTouchEvent(ui::TouchEvent* event) {
     handled = status != ui::TOUCH_STATUS_UNKNOWN;
 
     if (status == ui::TOUCH_STATUS_QUEUED ||
-        status == ui::TOUCH_STATUS_QUEUED_END)
+        status == ui::TOUCH_STATUS_QUEUED_END) {
       gesture_recognizer_->QueueTouchEventForGesture(target, *event);
+      return true;
+    }
   }
 
   // Get the list of GestureEvents from GestureRecognizer.