Dispatch the Windows font caching IPCs in one filter. This avoids having the code that calls thos...

content/common/font_cache_dispatcher_win.h

+// Copyright (c) 2011 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 CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
+#define CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
+#pragma once
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "base/memory/singleton.h"
+#include "ipc/ipc_channel_proxy.h"
+
+// Dispatches messages used for font caching on Windows. This is needed because
+// Windows can't load fonts into its kernel cache in sandboxed processes. So the
+// sandboxed process asks the browser process to do this for it.
+class FontCacheDispatcher : public IPC::ChannelProxy::MessageFilter,
+                            public IPC::Message::Sender {
+ public:
+  FontCacheDispatcher();
+  virtual ~FontCacheDispatcher();
+
+  // IPC::Message::Sender implementation:
+  virtual bool Send(IPC::Message* message) OVERRIDE;
+
+ private:
+  // IPC::ChannelProxy::MessageFilter implementation:
+  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnChannelClosing() OVERRIDE;
+
+  // Message handlers.
+  void OnPreCacheFont(const LOGFONT& font);
+  void OnReleaseCachedFonts();
+
+  IPC::Channel* channel_;
+
+  DISALLOW_COPY_AND_ASSIGN(FontCacheDispatcher);
+};
+
+#endif  // CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_