Be explicit about forcing TouchSelectionController updates

ui/touch_selection/touch_selection_controller_unittest.cc

Index: ui/touch_selection/touch_selection_controller_unittest.cc
diff --git a/ui/touch_selection/touch_selection_controller_unittest.cc b/ui/touch_selection/touch_selection_controller_unittest.cc
index 6a22b0e9f02d71b3b2c4f6634595a0edccb58ab4..46c2f4f9cd1481aec32ecef38cea46a99522b079 100644
--- a/ui/touch_selection/touch_selection_controller_unittest.cc
+++ b/ui/touch_selection/touch_selection_controller_unittest.cc
@@ -946,6 +946,9 @@ TEST_F(TouchSelectionControllerTest, AllowShowingFromCurrentSelection) {
   ChangeSelection(start_rect, visible, end_rect, visible);
   EXPECT_EQ(gfx::PointF(), GetLastEventStart());
 
+  // A longpress should have no immediate effect.
+  controller().OnLongPressEvent();
+
   // Now explicitly allow showing from the previously supplied bounds.
   controller().AllowShowingFromCurrentSelection();
   EXPECT_THAT(GetAndResetEvents(), ElementsAre(SELECTION_SHOWN));