[Extension Toolbar Redesign] Wants to act treatment, redux - left click

chrome/browser/ui/toolbar/toolbar_action_view_controller.h

 // Copyright 2014 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 CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTION_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTION_VIEW_CONTROLLER_H_
 
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image.h"
 
@@ skipping 72 matching lines @@
 
   // Executes the default action (which is typically showing the popup). If
   // |by_user| is true, then this was through a direct user action (as oppposed
   // to, e.g., an API call).
   // Returns true if a popup is shown.
   virtual bool ExecuteAction(bool by_user) = 0;
 
   // Updates the current state of the action.
   virtual void UpdateState() = 0;
 
+  // Returns true if clicking on an otherwise-disabled action should open the
+  // context menu.
+  virtual bool DisabledClickOpensMenu() const = 0;
+
   // Registers an accelerator. Called when the view is added to the hierarchy.
   // Unregistering any commands is the responsibility of the controller.
   virtual void RegisterCommand() {
   }
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTION_VIEW_CONTROLLER_H_