[Extensions Toolbar] Make the ExtensionToolbarModel icon count more stable

chrome/browser/ui/views/toolbar/browser_actions_container.h

 // Copyright 2013 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_VIEWS_TOOLBAR_BROWSER_ACTIONS_CONTAINER_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTIONS_CONTAINER_H_
 
 #include "base/observer_list.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "chrome/browser/ui/toolbar/toolbar_actions_bar.h"
@@ skipping 215 matching lines @@
   // Overridden from ToolbarActionView::Delegate:
   content::WebContents* GetCurrentWebContents() override;
   bool ShownInsideMenu() const override;
   void OnToolbarActionViewDragDone() override;
   views::MenuButton* GetOverflowReferenceView() override;
   void SetPopupOwner(ToolbarActionView* popup_owner) override;
   void HideActivePopup() override;
   ToolbarActionView* GetMainViewForAction(ToolbarActionView* view) override;
 
   // ToolbarActionsBarDelegate:
+  bool IsReady() const override;
   void AddViewForAction(ToolbarActionViewController* action,
                         size_t index) override;
   void RemoveViewForAction(ToolbarActionViewController* action) override;
   void RemoveAllViews() override;
   void Redraw(bool order_changed) override;
   void ResizeAndAnimate(gfx::Tween::Type tween_type,
                         int target_width,
                         bool suppress_chevron) override;
   void SetChevronVisibility(bool chevron_visible) override;
   int GetWidth() const override;
@@ skipping 92 matching lines @@
 
   // The class that registers for keyboard shortcuts for extension commands.
   scoped_ptr<ExtensionKeybindingRegistryViews> extension_keybinding_registry_;
 
   ObserverList<BrowserActionsContainerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActionsContainer);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTIONS_CONTAINER_H_