Keep reference view pressed while extension actions have a popup

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index 6c9a1629119b5947cfe2cce1f052bf0c055b1e1f..5ea7e3f58f134b501e086149dd23c9a312f12dcd 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -98,6 +98,14 @@ class VIEWS_EXPORT CustomButton : public Button,
   // Construct the Button with a Listener. See comment for Button's ctor.
   explicit CustomButton(ButtonListener* listener);
 
+  // Returns whether or not the button should respond to mouse events. This
+  // could be false if e.g. the button is showing a menu and wants to remain
+  // pressed.
+  // This is checked for mouse movement (OnMouse[Entered|Exited|Moved]) only;
+  // other mouse events (like OnMousePressed) are still processed normally.
+  // Defaults to true.
+  virtual bool ShouldRespondToMouseMovement();
+
   // Invoked from SetState() when SetState() is passed a value that differs from
   // the current state. CustomButton's implementation of StateChanged() does
   // nothing; this method is provided for subclasses that wish to do something