Moved theme related state from BrowserInstantController to InstantService.

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/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/common/instant_types.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class GURL;
 class InstantIOContext;
+class InstantServiceObserver;
 class Profile;
+class ThemeService;
 
 namespace net {
 class URLRequest;
 }
 
 // Tracks render process host IDs that are associated with Instant.
 class InstantService : public BrowserContextKeyedService,
                        public content::NotificationObserver {
  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.
+  void AddObserver(InstantServiceObserver* observer);
+  void RemoveObserver(InstantServiceObserver* observer);
+
 #if defined(UNIT_TEST)
   int GetInstantProcessCount() const {
     return process_ids_.size();
   }
 #endif
 
   // Most visited item API.
 
   // Invoked by the InstantController when the Instant page wants to delete a
   // Most Visited item.
   void DeleteMostVisitedItem(const GURL& url);
 
   // Invoked by the InstantController when the Instant page wants to undo the
   // blacklist action.
   void UndoMostVisitedDeletion(const GURL& url);
 
   // Invoked by the InstantController when the Instant page wants to undo all
   // Most Visited deletions.
   void UndoAllMostVisitedDeletions();
 
   // Returns the last added InstantMostVisitedItems.
   void GetCurrentMostVisitedItems(
       std::vector<InstantMostVisitedItem>* items) const;
 
+  // Invoked by the InstantController to update theme information for NTP.
+  //
+  // TODO(kmadhusu): Invoking this from InstantController shouldn't be
+  // necessary. Investigate more and remove this from here.
+  void UpdateThemeInfo();
+
  private:
   // Overridden from BrowserContextKeyedService:
   virtual void Shutdown() OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // 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);
 
+  // Theme changed notification handler.
+  void OnThemeChanged(ThemeService* theme_service);
+
   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_;
+
+  ObserverList<InstantServiceObserver> observers_;
+
   content::NotificationRegistrar registrar_;
 
   scoped_refptr<InstantIOContext> instant_io_context_;
 
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_