Make ToolbarActionsModel ignore calls to AddComponentAction() before initialization

chrome/browser/ui/toolbar/toolbar_actions_model.h

 // Copyright (c) 2012 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_ACTIONS_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_MODEL_H_
 
 #include <stddef.h>
 
 #include "base/compiler_specific.h"
@@ skipping 163 matching lines @@
   HighlightType highlight_type() const { return highlight_type_; }
 
   bool has_active_bubble() const { return has_active_bubble_; }
   void set_has_active_bubble(bool has_active_bubble) {
     has_active_bubble_ = has_active_bubble;
   }
 
   void SetActionVisibility(const std::string& action_id, bool visible);
 
   // ComponentMigrationHelper::ComponentActionDelegate:
+  // AddComponentAction() is a no-op if |actions_initialized_| is false.
   void AddComponentAction(const std::string& action_id) override;
   void RemoveComponentAction(const std::string& action_id) override;
   bool HasComponentAction(const std::string& action_id) const override;
 
   void OnActionToolbarPrefChange();
 
   // Highlights the actions specified by |action_ids|. This will cause
   // the ToolbarModel to only display those actions.
   // Highlighting mode is only entered if there is at least one action to be
   // shown.
@@ skipping 143 matching lines @@
   // For observing change of toolbar order preference by external entity (sync).
   PrefChangeRegistrar pref_change_registrar_;
   base::Closure pref_change_callback_;
 
   base::WeakPtrFactory<ToolbarActionsModel> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ToolbarActionsModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_MODEL_H_