[Extensions Toolbar] Move some popup logic to be platform-agnostic

chrome/browser/ui/toolbar/toolbar_action_view_delegate.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_DELEGATE_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTION_VIEW_DELEGATE_H_
 
 class ToolbarActionViewController;
 
 namespace content {
 class WebContents;
 }
 
 // The view for a ToolbarAction, which is controlled by a
 // ToolbarActionViewController.
 class ToolbarActionViewDelegate {
  public:
   // In some cases (such as when an action is shown in a menu), a substitute
   // ToolbarActionViewController should be used for showing popups. This
   // returns the preferred controller.
   virtual ToolbarActionViewController* GetPreferredPopupViewController() = 0;
 
   // Returns the current web contents.
   virtual content::WebContents* GetCurrentWebContents() const = 0;
 
   // Updates the view to reflect current state.
   virtual void UpdateState() = 0;
 
+  // Called when a popup is shown. If |by_user| is true, then this was through
+  // a direct user action (as oppposed to, e.g., an API call).
+  virtual void OnPopupShown(bool by_user) {}
+
+  // Called when a popup is closed.
+  virtual void OnPopupClosed() {}
+
  protected:
   virtual ~ToolbarActionViewDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTION_VIEW_DELEGATE_H_