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

chrome/browser/ui/webui/snippets_internals_message_handler.h

Index: chrome/browser/ui/webui/snippets_internals_message_handler.h
diff --git a/chrome/browser/ui/webui/snippets_internals_message_handler.h b/chrome/browser/ui/webui/snippets_internals_message_handler.h
index d6911cfe20d8a3fce0bbe9dff2fdca72f55a034d..07bb68a587700fe6cfa7a31a352e2c0cd6cb8d86 100644
--- a/chrome/browser/ui/webui/snippets_internals_message_handler.h
+++ b/chrome/browser/ui/webui/snippets_internals_message_handler.h
@@ -22,12 +22,14 @@ 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:
@@ -52,9 +54,11 @@ class SnippetsInternalsMessageHandler
   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);
@@ -72,6 +76,7 @@ class SnippetsInternalsMessageHandler
 
   ntp_snippets::RemoteSuggestionsProvider* ntp_snippets_service_;
   ntp_snippets::ContentSuggestionsService* content_suggestions_service_;
+  PrefService* pref_service_;
 
   std::map<ntp_snippets::Category,
            DismissedState,