Add a unified resource tracker shared between the proxy and the impl.

ppapi/proxy/plugin_dispatcher.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_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;
+class Resource;
 }
 
 namespace pp {
 namespace proxy {
 
 // Used to keep track of per-instance data.
 struct InstanceData {
   InstanceData() : fullscreen(PP_FALSE) {}
   PP_Rect position;
   PP_Bool fullscreen;
@@ skipping 38 matching lines @@
   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);
 
+  // Same as GetForInstance but retrieves the instance from the given resource
+  // object as a convenience. Returns NULL on failure.
+  static PluginDispatcher* GetForResource(const ppapi::Resource* resource);
+
   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.
@@ skipping 68 matching lines @@
 
   uint32 plugin_dispatcher_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_