UserPolicyCache only becomes ready after policy has been fetched.

chrome/test/base/testing_browser_process.h

 // Copyright (c) 2011 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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_
@@ skipping 108 matching lines @@
   virtual ComponentUpdateService* component_updater() OVERRIDE;
   virtual CRLSetFetcher* crl_set_fetcher() OVERRIDE;
 
   // Set the local state for tests. Consumer is responsible for cleaning it up
   // afterwards (using ScopedTestingLocalState, for example).
   void SetLocalState(PrefService* local_state);
   void SetGoogleURLTracker(GoogleURLTracker* google_url_tracker);
   void SetProfileManager(ProfileManager* profile_manager);
   void SetIOThread(IOThread* io_thread);
   void SetDevToolsManager(DevToolsManager*);
+  void SetBrowserPolicyConnector(policy::BrowserPolicyConnector* connector);
 
  private:
   NotificationServiceImpl notification_service_;
   unsigned int module_ref_count_;
   scoped_ptr<ui::Clipboard> clipboard_;
   std::string app_locale_;
 
   // Weak pointer.
   PrefService* local_state_;
   scoped_ptr<policy::BrowserPolicyConnector> browser_policy_connector_;
   scoped_ptr<GoogleURLTracker> google_url_tracker_;
   scoped_ptr<ProfileManager> profile_manager_;
   scoped_ptr<NotificationUIManager> notification_ui_manager_;
   scoped_ptr<printing::BackgroundPrintingManager> background_printing_manager_;
   scoped_ptr<prerender::PrerenderTracker> prerender_tracker_;
   IOThread* io_thread_;
   scoped_ptr<DevToolsManager> devtools_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcess);
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_