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diff --git a/ppapi/proxy/plugin_dispatcher.h b/ppapi/proxy/plugin_dispatcher.h
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+// 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_DISPATCHER_H_
+#define PPAPI_PROXY_PLUGIN_DISPATCHER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/hash_tables.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/process.h"
+#include "build/build_config.h"
+#include "ppapi/c/pp_rect.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/proxy/dispatcher.h"
+#include "ppapi/shared_impl/function_group_base.h"
+#include "ppapi/shared_impl/ppapi_preferences.h"
+
+class MessageLoop;
+
+namespace base {
+class WaitableEvent;
+}
+
+namespace ppapi {
+struct Preferences;
+}
+
+namespace pp {
+namespace proxy {
+
+// Used to keep track of per-instance data.
+struct InstanceData {
+  InstanceData() : fullscreen(PP_FALSE) {}
+  PP_Rect position;
+  PP_Bool fullscreen;
+};
+
+class PluginDispatcher : public Dispatcher {
+ public:
+  class PluginDelegate : public ProxyChannel::Delegate {
+   public:
+    // Returns the set used for globally uniquifying PP_Instances. This same
+    // set must be returned for all channels.
+    //
+    // DEREFERENCE ONLY ON THE I/O THREAD.
+    virtual std::set<PP_Instance>* GetGloballySeenInstanceIDSet() = 0;
+
+    // Returns the WebKit forwarding object used to make calls into WebKit.
+    // Necessary only on the plugin side.
+    virtual ppapi::WebKitForwarding* GetWebKitForwarding() = 0;
+
+    // Posts the given task to the WebKit thread associated with this plugin
+    // process. The WebKit thread should be lazily created if it does not
+    // exist yet.
+    virtual void PostToWebKitThread(const tracked_objects::Location& from_here,
+                                    const base::Closure& task) = 0;
+
+    // Sends the given message to the browser. Identical semantics to
+    // IPC::Message::Sender interface.
+    virtual bool SendToBrowser(IPC::Message* msg) = 0;
+
+    // Registers the plugin dispatcher and returns an ID.
+    // Plugin dispatcher IDs will be used to dispatch messages from the browser.
+    // Each call to Register() has to be matched with a call to Unregister().
+    virtual uint32 Register(PluginDispatcher* plugin_dispatcher) = 0;
+    virtual void Unregister(uint32 plugin_dispatcher_id) = 0;
+  };
+
+  // Constructor for the plugin side. The init and shutdown functions will be
+  // will be automatically called when requested by the renderer side. The
+  // module ID will be set upon receipt of the InitializeModule message.
+  //
+  // You must call InitPluginWithChannel after the constructor.
+  PluginDispatcher(base::ProcessHandle remote_process_handle,
+                   GetInterfaceFunc get_interface);
+  virtual ~PluginDispatcher();
+
+  // The plugin side maintains a mapping from PP_Instance to Dispatcher so
+  // that we can send the messages to the right channel if there are multiple
+  // renderers sharing the same plugin. This mapping is maintained by
+  // DidCreateInstance/DidDestroyInstance.
+  static PluginDispatcher* GetForInstance(PP_Instance instance);
+
+  static const void* GetInterfaceFromDispatcher(const char* interface);
+
+  // You must call this function before anything else. Returns true on success.
+  // The delegate pointer must outlive this class, ownership is not
+  // transferred.
+  bool InitPluginWithChannel(PluginDelegate* delegate,
+                             const IPC::ChannelHandle& channel_handle,
+                             bool is_client);
+
+  // Dispatcher overrides.
+  virtual bool IsPlugin() const;
+  virtual bool Send(IPC::Message* msg);
+
+  // IPC::Channel::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg);
+  virtual void OnChannelError();
+
+  // Keeps track of which dispatcher to use for each instance, active instances
+  // and tracks associated data like the current size.
+  void DidCreateInstance(PP_Instance instance);
+  void DidDestroyInstance(PP_Instance instance);
+
+  // Gets the data for an existing instance, or NULL if the instance id doesn't
+  // correspond to a known instance.
+  InstanceData* GetInstanceData(PP_Instance instance);
+
+  // Posts the given task to the WebKit thread.
+  void PostToWebKitThread(const tracked_objects::Location& from_here,
+                          const base::Closure& task);
+
+  // Calls the PluginDelegate.SendToBrowser function.
+  bool SendToBrowser(IPC::Message* msg);
+
+  // Returns the WebKitForwarding object used to forward events to WebKit.
+  ppapi::WebKitForwarding* GetWebKitForwarding();
+
+  // Returns the Preferences.
+  const ppapi::Preferences& preferences() const { return preferences_; }
+
+  // Returns the "new-style" function API for the given interface ID, creating
+  // it if necessary.
+  // TODO(brettw) this is in progress. It should be merged with the target
+  // proxies so there is one list to consult.
+  ppapi::FunctionGroupBase* GetFunctionAPI(
+      pp::proxy::InterfaceID id);
+
+  uint32 plugin_dispatcher_id() const { return plugin_dispatcher_id_; }
+
+ private:
+  friend class PluginDispatcherTest;
+
+  // Notifies all live instances that they're now closed. This is used when
+  // a renderer crashes or some other error is received.
+  void ForceFreeAllInstances();
+
+  // IPC message handlers.
+  void OnMsgSupportsInterface(const std::string& interface_name, bool* result);
+  void OnMsgSetPreferences(const ::ppapi::Preferences& prefs);
+
+  PluginDelegate* plugin_delegate_;
+
+  // All target proxies currently created. These are ones that receive
+  // messages.
+  scoped_ptr<InterfaceProxy> target_proxies_[INTERFACE_ID_COUNT];
+
+  // Function proxies created for "new-style" FunctionGroups.
+  // TODO(brettw) this is in progress. It should be merged with the target
+  // proxies so there is one list to consult.
+  scoped_ptr< ::ppapi::FunctionGroupBase >
+      function_proxies_[INTERFACE_ID_COUNT];
+
+  typedef base::hash_map<PP_Instance, InstanceData> InstanceDataMap;
+  InstanceDataMap instance_map_;
+
+  // The preferences sent from the host. We only want to set this once, which
+  // is what the received_preferences_ indicates. See OnMsgSetPreferences.
+  bool received_preferences_;
+  ppapi::Preferences preferences_;
+
+  uint32 plugin_dispatcher_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
+};
+
+}  // namespace proxy
+}  // namespace pp
+
+#endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_