DirectWrite Font Cache browser side hookup

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 "chrome/utility/utility_message_handler.h"
+
+// Handles requests to build static direct write font cache. Must be invoked

[cpu_(ooo_6.6-7.5), 2014/11/14 18:13:52]

..to build a static direct ..

[Shrikant Kelkar, 2014/11/14 18:51:53]

Done.

+// in a non-sandboxed utility process. We build static font cache in utility
+// process as it is time consuming as well as exception prone thing. We already

[cpu_(ooo_6.6-7.5), 2014/11/14 18:13:52]

as well as crash prone.

[Shrikant Kelkar, 2014/11/14 18:51:53]

Done.

+// 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() {}
+  virtual ~FontCacheHandler() {}
+
+  // IPC::Listener implementation
+  virtual bool OnMessageReceived(const IPC::Message& message) override;
+
+ private:
+  void OnBuildFontCache(const base::FilePath& full_path);
+
+  DISALLOW_COPY_AND_ASSIGN(FontCacheHandler);
+};
+
+#endif  // CHROME_UTILITY_FONT_CACHE_HANDLER_WIN_H_