Support touch scroll gestures in menus.

views/controls/menu/menu_controller.cc

Index: views/controls/menu/menu_controller.cc
diff --git a/views/controls/menu/menu_controller.cc b/views/controls/menu/menu_controller.cc
index 84433b5e8bb358bb75b7f162f11371c93c3b512e..6e0da32860bfad6d92e1992db8866b2f37024a2a 100644
--- a/views/controls/menu/menu_controller.cc
+++ b/views/controls/menu/menu_controller.cc
@@ -610,6 +610,14 @@ bool MenuController::OnMouseWheel(SubmenuView* source,
   MenuPart part = GetMenuPart(source, event.location());
   return part.submenu && part.submenu->OnMouseWheel(event);
 }
+
+ui::GestureStatus MenuController::OnGestureEvent(SubmenuView* source,
+                                    const GestureEvent& event) {
+  MenuPart part = GetMenuPart(source, event.location());
+  if (!part.submenu)
+    return ui::GESTURE_STATUS_UNKNOWN;
+  return part.submenu->OnGestureEvent(event);
+}
 #endif
 
 bool MenuController::GetDropFormats(