Make ToolbarActionsModel ignore calls to AddComponentAction() before initialization

chrome/browser/ui/toolbar/media_router_action_controller_unittest.cc

 // 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.
 
 #include <memory>
 #include <string>
 
 #include "chrome/browser/media/router/mock_media_router.h"
 #include "chrome/browser/ui/toolbar/component_toolbar_actions_factory.h"
 #include "chrome/browser/ui/toolbar/media_router_action_controller.h"
@@ skipping 21 matching lines @@
     EXPECT_TRUE(HasComponentAction(
         ComponentToolbarActionsFactory::kMediaRouterActionId));
     has_media_router_action_ = false;
   }
 
   bool HasComponentAction(const std::string& action_id) const override {
     EXPECT_EQ(action_id, ComponentToolbarActionsFactory::kMediaRouterActionId);
     return has_media_router_action_;
   }
 
+  bool ActionsInitialized() const override { return true; }
+
  private:
   bool has_media_router_action_ = false;
 };
 
 class MediaRouterActionControllerUnitTest : public MediaRouterTest {
  public:
   MediaRouterActionControllerUnitTest()
       : issue_(media_router::Issue(
             "title notification",
             "message notification",
@@ skipping 134 matching lines @@
 
   SetAlwaysShowActionPref(true);
   controller()->OnRoutesUpdated(non_local_display_route_list(),
                                 empty_route_id_list());
   // Removing the local route should not hide the icon.
   EXPECT_TRUE(ActionExists());
 
   SetAlwaysShowActionPref(false);
   EXPECT_FALSE(ActionExists());
 }