Selection Action mode triggered like a context menu

third_party/WebKit/Source/core/events/MouseEvent.h

Index: third_party/WebKit/Source/core/events/MouseEvent.h
diff --git a/third_party/WebKit/Source/core/events/MouseEvent.h b/third_party/WebKit/Source/core/events/MouseEvent.h
index eec939b184365b9c182f7d28dbb9afca903c9c74..1336e12c162299cbfc9523250efa263e88d33e22 100644
--- a/third_party/WebKit/Source/core/events/MouseEvent.h
+++ b/third_party/WebKit/Source/core/events/MouseEvent.h
@@ -47,6 +47,8 @@ class CORE_EXPORT MouseEvent : public UIEventWithKeyState {
     // Synthetic mouse events generated without a position, for example those
     // generated from keyboard input.
     kPositionless,
+    // Synthetic mouse event derived from Select All (used for context menu).
+    kFromSelectAll,
   };
 
   static MouseEvent* Create() { return new MouseEvent; }
@@ -110,6 +112,8 @@ class CORE_EXPORT MouseEvent : public UIEventWithKeyState {
 
   bool FromTouch() const { return synthetic_event_type_ == kFromTouch; }
 
+  bool FromSelectAll() const { return synthetic_event_type_ == kFromSelectAll; }
+
   const AtomicString& InterfaceName() const override;
 
   bool IsMouseEvent() const override;