Make ToolbarActionsModel ignore calls to AddComponentAction() before initialization

chrome/browser/extensions/component_migration_helper.h

 // Copyright 2016 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_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 59 matching lines @@
   // Object that knows how to manage component actions in the toolbar model.
   class ComponentActionDelegate {
    public:
     // Adds or removes the component action labeled by |action_id| from the
     // toolbar model.  The caller will not add the same action twice.
     virtual void AddComponentAction(const std::string& action_id) = 0;
     virtual void RemoveComponentAction(const std::string& action_id) = 0;
 
     // Returns |true| if the toolbar model has an action for |action_id|.
     virtual bool HasComponentAction(const std::string& action_id) const = 0;
+
+    // Returns |true| if the toolbar actions have been initialized.
+    virtual bool ActionsInitialized() const = 0;
   };
 
   ComponentMigrationHelper(Profile* profile, ComponentActionDelegate* delegate);
   ~ComponentMigrationHelper() override;
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // Registers and unregisters a component action/extension pair.  A component
   // action may have more than one associated extension id, but not vice versa.
   void Register(const std::string& component_action_id,
@@ skipping 49 matching lines @@
 
   // A list of pairs of component action ids and extension ids.
   std::vector<std::pair<std::string, ExtensionId>> migrated_actions_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentMigrationHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_