TopSites: filter out non-WebSafe URLs

chrome/browser/history/chrome_history_backend_client.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 CHROME_BROWSER_HISTORY_CHROME_HISTORY_BACKEND_CLIENT_H_
 #define CHROME_BROWSER_HISTORY_CHROME_HISTORY_BACKEND_CLIENT_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "components/history/core/browser/history_backend_client.h"
 
 namespace bookmarks {
 class BookmarkModel;
 }
 
 // ChromeHistoryBackendClient implements history::HistoryBackendClient interface
 // to provides access to embedder-specific features.
 class ChromeHistoryBackendClient : public history::HistoryBackendClient {
  public:
   explicit ChromeHistoryBackendClient(bookmarks::BookmarkModel* bookmark_model);
   ~ChromeHistoryBackendClient() override;
 
   // history::HistoryBackendClient implementation.
   bool IsBookmarked(const GURL& url) override;
   void GetBookmarks(std::vector<history::URLAndTitle>* bookmarks) override;
   bool ShouldReportDatabaseError() override;
+  bool IsWebSafe(const GURL& url) override;
 #if defined(OS_ANDROID)
   void OnHistoryBackendInitialized(
       history::HistoryBackend* history_backend,
       history::HistoryDatabase* history_database,
       history::ThumbnailDatabase* thumbnail_database,
       const base::FilePath& history_dir) override;
   void OnHistoryBackendDestroyed(history::HistoryBackend* history_backend,
                                  const base::FilePath& history_dir) override;
 #endif  // defined(OS_ANDROID)
 
  private:
   // BookmarkModel instance providing access to bookmarks. May be null during
   // testing but must outlive ChromeHistoryBackendClient if non-null.
   bookmarks::BookmarkModel* bookmark_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeHistoryBackendClient);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_CHROME_HISTORY_BACKEND_CLIENT_H_