Enable webview tag in webui

extensions/browser/guest_view/guest_view_base.cc

 // Copyright 2014 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 "extensions/browser/guest_view/guest_view_base.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 118 matching lines @@
 
   const Extension* embedder_extension = ExtensionRegistry::Get(browser_context_)
           ->enabled_extensions()
           .GetByID(embedder_extension_id);
   // Ok for |embedder_extension| to be NULL, the embedder might be WebUI.
 
   CHECK(embedder_web_contents);
   int embedder_process_id =
       embedder_web_contents->GetRenderProcessHost()->GetID();
 
+  const GURL& embedder_site_url = embedder_web_contents->GetLastCommittedURL();
   Feature::Availability availability = feature->IsAvailableToContext(
       embedder_extension,
       process_map->GetMostLikelyContextType(embedder_extension,
                                             embedder_process_id),
-      embedder_web_contents->GetLastCommittedURL());
+      embedder_site_url);
   if (!availability.is_available()) {
     // The derived class did not create a WebContents so this class serves no
     // purpose. Let's self-destruct.
     delete this;
     callback.Run(NULL);
     return;
   }
 
   CreateWebContents(embedder_extension_id,
                     embedder_process_id,
+                    embedder_site_url,
                     create_params,
                     base::Bind(&GuestViewBase::CompleteInit,
                                AsWeakPtr(),
                                embedder_extension_id,
                                embedder_process_id,
                                callback));
 }
 
 void GuestViewBase::InitWithWebContents(
     const std::string& embedder_extension_id,
@@ skipping 325 matching lines @@
 
 // static
 void GuestViewBase::RegisterGuestViewTypes() {
   AppViewGuest::Register();
   ExtensionOptionsGuest::Register();
   MimeHandlerViewGuest::Register();
   WebViewGuest::Register();
 }
 
 }  // namespace extensions