Convert more interfaces to the new thunk system. This goes up to and including

ppapi/proxy/plugin_resource_tracker.cc

 // 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.
 
 #include "ppapi/proxy/plugin_resource_tracker.h"
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 121 matching lines @@
 
 ::ppapi::FunctionGroupBase* PluginResourceTracker::GetFunctionAPI(
     PP_Instance inst,
     pp::proxy::InterfaceID id) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(inst);
   if (dispatcher)
     return dispatcher->GetFunctionAPI(id);
   return NULL;
 }
 
+PP_Instance PluginResourceTracker::GetInstanceForResource(
+    PP_Resource resource) {
+  ResourceMap::iterator found = resource_map_.find(resource);
+  if (found == resource_map_.end())
+    return 0;
+  return found->second.resource->instance();
+}
+
 void PluginResourceTracker::ReleasePluginResourceRef(
     const PP_Resource& resource,
     bool notify_browser_on_release) {
   ResourceMap::iterator found = resource_map_.find(resource);
   if (found == resource_map_.end())
     return;
   found->second.ref_count--;
   if (found->second.ref_count == 0) {
     // Keep a reference while removing in case the destructor ends up
     // re-entering. That way, when the destructor is called, it's out of the
@@ skipping 14 matching lines @@
     // tell the host about.
     if (notify_browser_on_release && dispatcher && !host_resource.is_null()) {
       dispatcher->Send(new PpapiHostMsg_PPBCore_ReleaseResource(
           INTERFACE_ID_PPB_CORE, host_resource));
     }
   }
 }
 
 }  // namespace proxy
 }  // namespace pp