Parse PopularSites JSON by callback.

components/ntp_tiles/popular_sites.h

 // Copyright 2015 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 COMPONENTS_NTP_TILES_POPULAR_SITES_H_
 #define COMPONENTS_NTP_TILES_POPULAR_SITES_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 20 matching lines @@
 
 namespace variations {
 class VariationsService;
 }
 
 class PrefService;
 class TemplateURLService;
 
 namespace ntp_tiles {
 
+using ParseJSONCallback = base::Callback<void(
+    const std::string& unsafe_json,
+    const base::Callback<void(std::unique_ptr<base::Value>)>& success_callback,
+    const base::Callback<void(const std::string&)>& error_callback)>;
+
 // Downloads and provides a list of suggested popular sites, for display on
 // the NTP when there are not enough personalized suggestions. Caches the
 // downloaded file on disk to avoid re-downloading on every startup.
 class PopularSites : public net::URLFetcherDelegate {
  public:
   struct Site {
     Site(const base::string16& title,
          const GURL& url,
          const GURL& favicon_url,
          const GURL& large_icon_url,
          const GURL& thumbnail_url);
     Site(const Site& other);
     ~Site();
 
     base::string16 title;
     GURL url;
     GURL favicon_url;
     GURL large_icon_url;
     GURL thumbnail_url;
   };
 
   using FinishedCallback = base::Callback<void(bool /* success */)>;
 
   PopularSites(const scoped_refptr<base::SequencedWorkerPool>& blocking_pool,
                PrefService* prefs,
                const TemplateURLService* template_url_service,
                variations::VariationsService* variations_service,
                net::URLRequestContextGetter* download_context,
-               const base::FilePath& directory);
+               const base::FilePath& directory,
+               ParseJSONCallback parse_json);
 
   // Starts the process of retrieving popular sites. When they are available,
   // invokes |callback| with the result, on the same thread as the caller. Never
   // invokes |callback| before returning control to the caller, even if the
   // result is immediately known.
   //
   // Set |force_download| to enforce re-downloading the suggestions file, even
   // if it already exists on disk.
   //
   // Must be called at most once on a given PopularSites object.
@@ skipping 28 matching lines @@
   void ParseSiteList(std::unique_ptr<base::Value> json);
   void OnDownloadFailed();
 
   // Parameters set from constructor.
   scoped_refptr<base::TaskRunner> const blocking_runner_;
   PrefService* const prefs_;
   const TemplateURLService* const template_url_service_;
   variations::VariationsService* const variations_;
   net::URLRequestContextGetter* const download_context_;
   base::FilePath const local_path_;
+  ParseJSONCallback parse_json_;
 
   // Set by StartFetch() and called after fetch completes.
   FinishedCallback callback_;
 
   std::unique_ptr<net::URLFetcher> fetcher_;
   bool is_fallback_;
   std::vector<Site> sites_;
   GURL pending_url_;
 
   base::WeakPtrFactory<PopularSites> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSites);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_POPULAR_SITES_H_