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"
@@ skipping 25 matching lines @@
   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));
+
   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