Move IPC::MessageFilter and router to a separate file

ppapi/proxy/dispatcher.cc

 // Copyright (c) 2012 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.
 
 #include "ppapi/proxy/dispatcher.h"
 
 #include <string.h>  // For memset.
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/var_serialization_rules.h"
 
+namespace IPC {
+class MessageFilter;
+}
+
 namespace ppapi {
 namespace proxy {
 
 Dispatcher::Dispatcher(PP_GetInterface_Func local_get_interface,
                        const PpapiPermissions& permissions)
     : local_get_interface_(local_get_interface),
       permissions_(permissions) {
 }
 
 Dispatcher::~Dispatcher() {
 }
 
 InterfaceProxy* Dispatcher::GetInterfaceProxy(ApiID id) {
   InterfaceProxy* proxy = proxies_[id].get();
   if (!proxy) {
     // Handle the first time for a given API by creating the proxy for it.
     InterfaceProxy::Factory factory =
         InterfaceList::GetInstance()->GetFactoryForID(id);
     if (!factory) {
       NOTREACHED();
       return NULL;
     }
     proxy = factory(this);
     DCHECK(proxy);
     proxies_[id].reset(proxy);
   }
   return proxy;
 }
 
-void Dispatcher::AddIOThreadMessageFilter(
-    IPC::ChannelProxy::MessageFilter* filter) {
+void Dispatcher::AddIOThreadMessageFilter(IPC::MessageFilter* filter) {
   // Our filter is refcounted. The channel will call the destruct method on the
   // filter when the channel is done with it, so the corresponding Release()
   // happens there.
   channel()->AddFilter(filter);
 }
 
 bool Dispatcher::OnMessageReceived(const IPC::Message& msg) {
   if (msg.routing_id() <= 0 || msg.routing_id() >= API_ID_COUNT) {
     OnInvalidMessageReceived();
     return true;
@@ skipping 11 matching lines @@
 void Dispatcher::SetSerializationRules(
     VarSerializationRules* var_serialization_rules) {
   serialization_rules_ = var_serialization_rules;
 }
 
 void Dispatcher::OnInvalidMessageReceived() {
 }
 
 }  // namespace proxy
 }  // namespace ppapi