[Sync] Initial implementation of foreign sessions suggestions provider.

components/ntp_snippets/pref_names.cc

 // 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.
 
 #include "components/ntp_snippets/pref_names.h"
 
 namespace ntp_snippets {
 namespace prefs {
 
 const char kEnableSnippets[] = "ntp_snippets.enable";
@@ skipping 11 matching lines @@
     "ntp.request_throttler.suggestion_thumbnails.count";
 const char kSnippetThumbnailsInteractiveRequestCount[] =
     "ntp.request_throttler.suggestion_thumbnails.interactive_count";
 const char kSnippetThumbnailsRequestsDay[] =
     "ntp.request_throttler.suggestion_thumbnails.day";
 
 const char kDismissedRecentOfflineTabSuggestions[] =
     "ntp_suggestions.offline_pages.recent_tabs.dismissed_ids";
 const char kDismissedDownloadSuggestions[] =
     "ntp_suggestions.offline_pages.downloads.dismissed_ids";
+const char kDismissedForeignSessionsSuggestions[] =
+    "ntp_suggestions.foreign_sessions.dismissed_ids";
 
 const char kBookmarksFirstM54Start[] =
     "ntp_suggestions.bookmarks.first_M54_start";
 
 const char kUserClassifierAverageNTPOpenedPerHour[] =
     "ntp_suggestions.user_classifier.average_ntp_opened_per_hour";
 const char kUserClassifierAverageSuggestionsShownPerHour[] =
     "ntp_suggestions.user_classifier.average_suggestions_shown_per_hour";
 const char kUserClassifierAverageSuggestionsUsedPerHour[] =
     "ntp_suggestions.user_classifier.average_suggestions_used_per_hour";
 
 const char kUserClassifierLastTimeToOpenNTP[] =
     "ntp_suggestions.user_classifier.last_time_to_open_ntp";
 const char kUserClassifierLastTimeToShowSuggestions[] =
     "ntp_suggestions.user_classifier.last_time_to_show_suggestions";
 const char kUserClassifierLastTimeToUseSuggestions[] =
     "ntp_suggestions.user_classifier.last_time_to_use_suggestions";
 
-
 }  // namespace prefs
 }  // namespace ntp_snippets