Take 2 at implementing activeTab.

chrome/common/extensions/extension_messages.cc

 // 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.
 
 #include "chrome/common/extensions/extension_messages.h"
 
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/manifest.h"
 #include "content/public/common/common_param_traits.h"
 
 using extensions::Extension;
 
 ExtensionMsg_Loaded_Params::ExtensionMsg_Loaded_Params()
     : location(Extension::INVALID),
       creation_flags(Extension::NO_FLAGS){}
 
 ExtensionMsg_Loaded_Params::~ExtensionMsg_Loaded_Params() {}
 
 ExtensionMsg_Loaded_Params::ExtensionMsg_Loaded_Params(
     const Extension* extension)
     : manifest(extension->manifest()->value()->DeepCopy()),
       location(extension->location()),
       path(extension->path()),
       apis(extension->GetActivePermissions()->apis()),
       explicit_hosts(extension->GetActivePermissions()->explicit_hosts()),
       scriptable_hosts(extension->GetActivePermissions()->scriptable_hosts()),
       id(extension->id()),
       creation_flags(extension->creation_flags()) {
+  extension->GetAllTabSpecificHostPermissions(&tab_specific_host_permissions);
 }
 
 scoped_refptr<Extension>
     ExtensionMsg_Loaded_Params::ConvertToExtension() const {
   std::string error;
 
   scoped_refptr<Extension> extension(
       Extension::Create(path, location, *manifest, creation_flags,
                         &error));
   if (!extension.get()) {
     DLOG(ERROR) << "Error deserializing extension: " << error;
     return extension;
   }
 
   extension->SetActivePermissions(
         new ExtensionPermissionSet(apis, explicit_hosts, scriptable_hosts));
+  extension->SetAllTabSpecificHostPermissions(tab_specific_host_permissions);
+
   return extension;
 }
 
 namespace IPC {
 
 template <>
 struct ParamTraits<Extension::Location> {
   typedef Extension::Location param_type;
   static void Write(Message* m, const param_type& p) {
     int val = static_cast<int>(p);
@@ skipping 104 matching lines @@
          ReadParam(m, iter, &p->explicit_hosts) &&
          ReadParam(m, iter, &p->scriptable_hosts);
 }
 
 void ParamTraits<ExtensionMsg_Loaded_Params>::Log(const param_type& p,
                                                   std::string* l) {
   l->append(p.id);
 }
 
 }  // namespace IPC