Never lock the Pepper proxy lock on the IO thread

ppapi/proxy/plugin_message_filter.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 PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
 #define PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
 
 #include <set>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "ipc/ipc_sender.h"
 #include "ipc/message_filter.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/proxy/resource_message_filter.h"
 
 namespace ppapi {
 namespace proxy {
 
 class ResourceMessageReplyParams;
 class ResourceReplyThreadRegistrar;
 
 // Listens for messages on the I/O thread of the plugin and handles some of
 // them to avoid needing to block on the plugin.
 //
@@ skipping 15 matching lines @@
   virtual ~PluginMessageFilter();
 
   // MessageFilter implementation.
   virtual void OnFilterAdded(IPC::Sender* sender) override;
   virtual void OnFilterRemoved() override;
   virtual bool OnMessageReceived(const IPC::Message& message) override;
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* msg) override;
 
+  void AddResourceMessageFilter(
+      const scoped_refptr<ResourceMessageFilter>& filter);
+
   // Simulates an incoming resource reply that is handled on the calling thread.
   // For testing only.
   static void DispatchResourceReplyForTest(
       const ResourceMessageReplyParams& reply_params,
       const IPC::Message& nested_msg);
 
  private:
   void OnMsgReserveInstanceId(PP_Instance instance, bool* usable);
   void OnMsgResourceReply(const ResourceMessageReplyParams& reply_params,
                           const IPC::Message& nested_msg);
 
   // Dispatches the given resource reply to the appropriate resource in the
   // plugin process.
   static void DispatchResourceReply(
       const ResourceMessageReplyParams& reply_params,
       const IPC::Message& nested_msg);
 
   // All instance IDs ever queried by any renderer on this plugin. This is used
   // to make sure that new instance IDs are unique. This is a non-owning
   // pointer. It is managed by PluginDispatcher::PluginDelegate.
   std::set<PP_Instance>* seen_instance_ids_;
 
   scoped_refptr<ResourceReplyThreadRegistrar> resource_reply_thread_registrar_;
 
+  std::vector<scoped_refptr<ResourceMessageFilter>> resource_filters_;
+
   // The IPC sender to the renderer. May be NULL if we're not currently
   // attached as a filter.
   IPC::Sender* sender_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_