Revert "Revert of Remove font cache code (patchset #3 id:40001 of https://codereview.chromium.org/1…

chrome/utility/font_cache_handler_win.h

-// Copyright 2014 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_UTILITY_FONT_CACHE_HANDLER_WIN_H_
-#define CHROME_UTILITY_FONT_CACHE_HANDLER_WIN_H_
-
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "chrome/utility/utility_message_handler.h"
-
-namespace base {
-class TaskRunner;
-class Thread;
-}
-
-// Handles requests to build a static direct write font cache. Must be invoked
-// in a non-sandboxed utility process. We build static font cache in utility
-// process as it is time consuming as well as crash prone thing. We already
-// have fall back of loading fonts from system fonts directory in place, so even
-// if we fail to build static cache in utility process, chrome will still
-// continue to run as is.
-class FontCacheHandler : public UtilityMessageHandler {
- public:
-  FontCacheHandler();
-  ~FontCacheHandler() override;
-
-  // IPC::Listener implementation
-  bool OnMessageReceived(const IPC::Message& message) override;
-
- private:
-  void OnBuildFontCache(const base::FilePath& full_path);
-  void StartBuildingFontCache(const base::FilePath& full_path);
-  void Cleanup();
-
-  scoped_refptr<base::TaskRunner> utility_task_runner_;
-
-  // Thread that caching process runs on, while FontCacheHandler handles
-  // messages from the browser process.
-  scoped_ptr<base::Thread> cache_thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(FontCacheHandler);
-};
-
-#endif  // CHROME_UTILITY_FONT_CACHE_HANDLER_WIN_H_