Handle TemplateURLService load failure better

chrome/browser/search/instant_service.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_SEARCH_INSTANT_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 
-#include <map>
 #include <set>
-#include <string>
 #include <vector>
 
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
+#include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
-#include "base/prefs/pref_change_registrar.h"
-#include "chrome/browser/google/google_url_tracker.h"
 #include "chrome/browser/history/history_types.h"
-#include "chrome/browser/ui/search/instant_search_prerenderer.h"
-#include "chrome/common/instant_types.h"
+#include "chrome/browser/search_engines/template_url_service_observer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "url/gurl.h"
 
-class GURL;
 class InstantIOContext;
+struct InstantMostVisitedItem;
+class InstantSearchPrerenderer;
 class InstantServiceObserver;
-class InstantTestBase;
-class InstantServiceTest;
 class Profile;
+struct TemplateURLData;
+struct ThemeBackgroundInfo;
 class ThemeService;
 
 namespace content {
 class RenderProcessHost;
 }
 
-namespace net {
-class URLRequest;
-}
-
 // Tracks render process host IDs that are associated with Instant.
 class InstantService : public KeyedService,
-                       public content::NotificationObserver {
+                       public content::NotificationObserver,
+                       public TemplateURLServiceObserver {
  public:
   explicit InstantService(Profile* profile);
   virtual ~InstantService();
 
   // Add, remove, and query RenderProcessHost IDs that are associated with
   // Instant processes.
   void AddInstantProcess(int process_id);
   bool IsInstantProcess(int process_id) const;
 
   // Adds/Removes InstantService observers.
@@ skipping 45 matching lines @@
 
  private:
   friend class InstantExtendedTest;
   friend class InstantServiceTest;
   friend class InstantTestBase;
   friend class InstantUnitTestBase;
 
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedManualTest,
                            MANUAL_SearchesFromFakebox);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, ProcessIsolation);
-  FRIEND_TEST_ALL_PREFIXES(InstantServiceTest, SendsSearchURLsToRenderer);
+  FRIEND_TEST_ALL_PREFIXES(InstantServiceEnabledTest,
+                           SendsSearchURLsToRenderer);
 
-  // Overridden from KeyedService:
+  // KeyedService:
   virtual void Shutdown() OVERRIDE;
 
-  // Overridden from content::NotificationObserver:
+  // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // TemplateURLServiceObserver:
+  virtual void OnTemplateURLServiceChanged() OVERRIDE;
+
   // Called when a renderer process is terminated.
   void OnRendererProcessTerminated(int process_id);
 
   // Called when we get new most visited items from TopSites, registered as an
   // async callback. Parses them and sends them to the renderer via
   // SendMostVisitedItems.
   void OnMostVisitedItemsReceived(const history::MostVisitedURLList& data);
 
   // Notifies the observer about the last known most visited items.
   void NotifyAboutMostVisitedItems();
 
   // Theme changed notification handler.
   void OnThemeChanged(ThemeService* theme_service);
 
-  void OnGoogleURLUpdated(Profile* profile,
-                          GoogleURLTracker::UpdatedDetails* details);
-
-  void OnDefaultSearchProviderChanged(const std::string& pref_name);
-
   void ResetInstantSearchPrerenderer();
 
   Profile* const profile_;
 
   // The process ids associated with Instant processes.
   std::set<int> process_ids_;
 
   // InstantMostVisitedItems sent to the Instant Pages.
   std::vector<InstantMostVisitedItem> most_visited_items_;
 
   // Theme-related data for NTP overlay to adopt themes.
   scoped_ptr<ThemeBackgroundInfo> theme_info_;
 
   // The start-edge margin of the omnibox, used by the Instant page to align
   // text or assets properly with the omnibox.
   int omnibox_start_margin_;
 
   ObserverList<InstantServiceObserver> observers_;
 
   content::NotificationRegistrar registrar_;
 
-  PrefChangeRegistrar profile_pref_registrar_;
-
   scoped_refptr<InstantIOContext> instant_io_context_;
 
   // Set to NULL if the default search provider does not support Instant.
   scoped_ptr<InstantSearchPrerenderer> instant_prerenderer_;
 
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;
 
+  // Used to check whether notifications from TemplateURLService indicate a
+  // change that affects the default search provider.
+  scoped_ptr<TemplateURLData> previous_default_search_provider_;
+  GURL previous_google_base_url_;
+
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_