Create a PPAPI host for new resource message routing.

ppapi/host/ppapi_host.h

Index: ppapi/host/ppapi_host.h
diff --git a/ppapi/host/ppapi_host.h b/ppapi/host/ppapi_host.h
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+// 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 "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"
+
+namespace ppapi {
+
+namespace proxy {
+class ResourceMessageCallParams;
+class ResourceMessageReplyParams;
+}
+
+namespace host {
+
+class HostFactory;
+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);
+  virtual ~PpapiHost();
+
+  // 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:
+  // 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_;
+
+  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_