[Popular Sites] Move PopularSitesImpl to dedicated file

components/ntp_tiles/popular_sites_impl.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef COMPONENTS_NTP_TILES_POPULAR_SITES_H_
-#define COMPONENTS_NTP_TILES_POPULAR_SITES_H_
+#ifndef COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
+#define COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
+#include "components/ntp_tiles/popular_sites.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
 namespace base {
 class Value;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 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)>;
 
-// Interface to provide a list of suggested popular sites, for display on the
-// NTP when there are not enough personalized tiles.
-class PopularSites {
- 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 SitesVector = std::vector<Site>;
-  using FinishedCallback = base::Callback<void(bool /* success */)>;
-
-  virtual ~PopularSites() = default;
-
-  // 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 popular sites file, even
-  // if it already exists on disk.
-  //
-  // Must be called at most once on a given PopularSites object.
-  // TODO(mastiz): Remove this restriction?
-  virtual void StartFetch(bool force_download,
-                          const FinishedCallback& callback) = 0;
-
-  // Returns the list of available sites.
-  virtual const SitesVector& sites() const = 0;
-
-  // Various internals exposed publicly for diagnostic pages only.
-  virtual GURL GetLastURLFetched() const = 0;
-  virtual const base::FilePath& local_path() const = 0;
-  virtual GURL GetURLToFetch() = 0;
-  virtual std::string GetCountryToFetch() = 0;
-  virtual std::string GetVersionToFetch() = 0;
-};
-
 // Actual (non-test) implementation of the PopularSites interface. Caches the
 // downloaded file on disk to avoid re-downloading on every startup.
 class PopularSitesImpl : public PopularSites, public net::URLFetcherDelegate {
  public:
   PopularSitesImpl(
       const scoped_refptr<base::SequencedWorkerPool>& blocking_pool,
       PrefService* prefs,
       const TemplateURLService* template_url_service,
       variations::VariationsService* variations_service,
       net::URLRequestContextGetter* download_context,
@@ skipping 49 matching lines @@
   SitesVector sites_;
   GURL pending_url_;
 
   base::WeakPtrFactory<PopularSitesImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSitesImpl);
 };
 
 }  // namespace ntp_tiles
 
-#endif  // COMPONENTS_NTP_TILES_POPULAR_SITES_H_
+#endif  // COMPONENTS_NTP_TILES_POPULAR_SITES_IMPL_H_