[NTPSnippets] Switch from TickClock to Clock for storing the last background fetched time.

chrome/browser/ui/webui/snippets_internals_message_handler.h

 // 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 CHROME_BROWSER_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/category_status.h"
 #include "components/ntp_snippets/content_suggestions_service.h"
 #include "components/ntp_snippets/remote/remote_suggestions_provider.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
+class PrefService;
+
 // The implementation for the chrome://snippets-internals page.
 class SnippetsInternalsMessageHandler
     : public content::WebUIMessageHandler,
       public ntp_snippets::ContentSuggestionsService::Observer {
  public:
-  SnippetsInternalsMessageHandler();
+  explicit SnippetsInternalsMessageHandler(PrefService* pref_service);
   ~SnippetsInternalsMessageHandler() override;
 
  private:
   enum class DismissedState { HIDDEN, LOADING, VISIBLE };
 
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
   // ntp_snippets::ContentSuggestionsService::Observer:
   void OnNewSuggestions(ntp_snippets::Category category) override;
   void OnCategoryStatusChanged(
       ntp_snippets::Category category,
       ntp_snippets::CategoryStatus new_status) override;
   void OnSuggestionInvalidated(
       const ntp_snippets::ContentSuggestion::ID& suggestion_id) override;
   void OnFullRefreshRequired() override;
   void ContentSuggestionsServiceShutdown() override;
 
   void HandleRefreshContent(const base::ListValue* args);
   void HandleDownload(const base::ListValue* args);
   void HandleClearCachedSuggestions(const base::ListValue* args);
   void HandleClearDismissedSuggestions(const base::ListValue* args);
   void HandleToggleDismissedSuggestions(const base::ListValue* args);
   void ClearClassification(const base::ListValue* args);
+  void FetchRemoteSuggestionsInTheBackground(const base::ListValue* args);
 
   void SendAllContent();
   void SendClassification();
+  void SendLastRemoteSuggestionsBackgroundFetchTime();
   void SendContentSuggestions();
   void SendBoolean(const std::string& name, bool value);
   void SendString(const std::string& name, const std::string& value);
 
   void OnDismissedSuggestionsLoaded(
       ntp_snippets::Category category,
       std::vector<ntp_snippets::ContentSuggestion> dismissed_suggestions);
 
   ScopedObserver<ntp_snippets::ContentSuggestionsService,
                  ntp_snippets::ContentSuggestionsService::Observer>
       content_suggestions_service_observer_;
 
   // Tracks whether we can already send messages to the page.
   bool dom_loaded_;
 
   ntp_snippets::RemoteSuggestionsProvider* ntp_snippets_service_;
   ntp_snippets::ContentSuggestionsService* content_suggestions_service_;
+  PrefService* pref_service_;
 
   std::map<ntp_snippets::Category,
            DismissedState,
            ntp_snippets::Category::CompareByID>
       dismissed_state_;
   std::map<ntp_snippets::Category,
            std::vector<ntp_snippets::ContentSuggestion>,
            ntp_snippets::Category::CompareByID>
       dismissed_suggestions_;
 
   base::WeakPtrFactory<SnippetsInternalsMessageHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SnippetsInternalsMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_