Hook up the PPB_Flash_Print interface to new host system.

ppapi/host/ppapi_host.h

 // 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.
 
 #ifndef PPAPI_HOST_PPAPI_HOST_H_
 #define PPAPI_HOST_PPAPI_HOST_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
+#include "base/observer_list.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/host/ppapi_host_export.h"
 #include "ppapi/shared_impl/ppapi_permissions.h"
 
 namespace ppapi {
 
 namespace proxy {
 class ResourceMessageCallParams;
 class ResourceMessageReplyParams;
 }
 
 namespace host {
 
 class HostFactory;
+class InstanceMessageFilter;
 class ResourceHost;
 
 // The host provides routing and tracking for resource message calls that
 // come from the plugin to the host (browser or renderer), and the
 // corresponding replies.
 class PPAPI_HOST_EXPORT PpapiHost : public IPC::Sender, public IPC::Listener {
  public:
   // The sender is the channel to the plugin for outgoing messages. The factory
   // will be used to receive resource creation messages from the plugin. Both
   // pointers are owned by the caller and must outlive this class.
   PpapiHost(IPC::Sender* sender,
             HostFactory* host_factory,
             const PpapiPermissions& perms);
   virtual ~PpapiHost();
 
   const PpapiPermissions& permissions() const { return permissions_; }
 
   // Sender implementation. Forwards to the sender_.
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
   // Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   // Sends the given reply message to the plugin.
   void SendReply(const proxy::ResourceMessageReplyParams& params,
                  const IPC::Message& msg);
 
  private:
+  friend class InstanceMessageFilter;
+
+  void AddInstanceMessageFilter(InstanceMessageFilter* filter);
+  void RemoveInstanceMessageFilter(InstanceMessageFilter* filter);
+
   // Message handlers.
   void OnHostMsgResourceCall(const proxy::ResourceMessageCallParams& params,
                              const IPC::Message& nested_msg);
   void OnHostMsgResourceCreated(const proxy::ResourceMessageCallParams& param,
                                 PP_Instance instance,
                                 const IPC::Message& nested_msg);
   void OnHostMsgResourceDestroyed(PP_Resource resource);
 
   // Returns null if the resource doesn't exist.
   host::ResourceHost* GetResourceHost(PP_Resource resource);
 
   // Non-owning pointer.
   IPC::Sender* sender_;
 
   // Non-owning pointer.
   HostFactory* host_factory_;
 
   PpapiPermissions permissions_;
 
+  // Filters for instance messages. Non-owning pointers.
+  ObserverList<InstanceMessageFilter> instance_message_filters_;
+
   typedef std::map<PP_Resource, linked_ptr<ResourceHost> > ResourceMap;
   ResourceMap resources_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiHost);
 };
 
 }  // namespace host
 }  // namespace ppapi
 
 #endif  // PPAPI_HOST_PPAPIE_HOST_H_