Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/base/ui_base_types.h

Index: ui/base/ui_base_types.h
diff --git a/ui/base/ui_base_types.h b/ui/base/ui_base_types.h
index 2f1bcec9eaed0d4ad9d7cdc2ad187538483f6c11..3b8ee9c7a5227d06d41c23f15962430af376af1c 100644
--- a/ui/base/ui_base_types.h
+++ b/ui/base/ui_base_types.h
@@ -5,8 +5,12 @@
 #ifndef UI_BASE_UI_BASE_TYPES_H_
 #define UI_BASE_UI_BASE_TYPES_H_
 
+#include "ui/base/ui_export.h"
+
 namespace ui {
 
+class Event;
+
 // Window "show" state.  These values are written to disk so should not be
 // changed.
 enum WindowShowState {
@@ -37,6 +41,17 @@ enum ModalType {
   MODAL_TYPE_SYSTEM = 3   // Window is modal to all other windows.
 };
 
+// TODO(varunjain): Remove MENU_SOURCE_NONE (crbug.com/250964)
+enum MenuSourceType {
+  MENU_SOURCE_NONE            = 0,
+  MENU_SOURCE_MOUSE           = 1,
+  MENU_SOURCE_KEYBOARD        = 2,
+  MENU_SOURCE_TOUCH           = 3,
+  MENU_SOURCE_TOUCH_EDIT_MENU = 4,
+};
+
+UI_EXPORT MenuSourceType GetMenuSourceTypeForEvent(const ui::Event& event);
+
 }  // namespace ui
 
 #endif  // UI_BASE_UI_BASE_TYPES_H_