Mac: OOP font loading should run on FILE thread.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 710db73b12fa053fe8b8d2f26e255e0f8063d6f2..61c97e64a1db4026f3f2d6c981566be2880bd412 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -26,6 +26,10 @@
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/surface/transport_dib.h"
 
+#if defined(OS_MACOSX)
+#include "content/common/mac/font_loader.h"
+#endif
+
 class DOMStorageContextImpl;
 class PluginServiceImpl;
 class RenderWidgetHelper;
@@ -131,10 +135,9 @@ class RenderMessageFilter : public content::BrowserMessageFilter {
                         bool* cookies_enabled);
 
 #if defined(OS_MACOSX)
-  void OnLoadFont(const FontDescriptor& font,
-                  uint32* handle_size,
-                  base::SharedMemoryHandle* handle,
-                  uint32* font_id);
+  // Messages for OOP font loading.
+  void OnLoadFont(const FontDescriptor& font, IPC::Message* reply_msg);
+  void SendLoadFontReply(IPC::Message* reply, FontLoader::Result* result);
 #endif
 
 #if defined(OS_WIN) && !defined(USE_AURA)