Context menus should appear above the touch point if invoked by long press.

ui/views/controls/menu/menu_controller.cc

Index: ui/views/controls/menu/menu_controller.cc
diff --git a/ui/views/controls/menu/menu_controller.cc b/ui/views/controls/menu/menu_controller.cc
index c8e966d66701e3f80a29661b05d0cdea7eb75873..d24124aa2d95a1cfa7e0222469ab3e42bfa47be3 100644
--- a/ui/views/controls/menu/menu_controller.cc
+++ b/ui/views/controls/menu/menu_controller.cc
@@ -1564,6 +1564,9 @@ gfx::Rect MenuController::CalculateMenuBounds(MenuItemView* item,
       x = x + state_.initial_bounds.width() - pref.width();
       if (MenuConfig::instance().offset_context_menus && state_.context_menu)
         x -= 1;
+    } else if (state_.anchor == MenuItemView::BOTTOMCENTER) {
+      x = x - (pref.width() - state_.initial_bounds.width()) / 2;
+      y = std::max(0, state_.initial_bounds.y() - pref.height());
     }
 
     if (!state_.monitor_bounds.IsEmpty() &&