Selection Action mode triggered like a context menu

third_party/WebKit/public/web/WebMenuSourceType.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebMenuSourceType_h
 #define WebMenuSourceType_h
 
 namespace blink {
 
 enum WebMenuSourceType {
   kMenuSourceNone,
   kMenuSourceMouse,
   kMenuSourceKeyboard,
   kMenuSourceTouch,
   kMenuSourceTouchEditMenu,
   kMenuSourceLongPress,
   kMenuSourceLongTap,
   kMenuSourceTouchHandle,
-  kMenuSourceTypeLast = kMenuSourceTouchHandle
+  kMenuSourceStylus,
+  kMenuSourceTypeLast = kMenuSourceStylus
 };
 
 }  // namespace blink
 
 #endif