permissionrequest API for guest Download.

chrome/browser/ui/views/external_tab_container_win.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/browser/ui/views/external_tab_container_win.h"
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlconv.h>
 #include <atlmisc.h>
@@ skipping 646 matching lines @@
 bool ExternalTabContainerWin::TakeFocus(content::WebContents* source,
                                         bool reverse) {
   if (automation_) {
     automation_->Send(new AutomationMsg_TabbedOut(tab_handle_,
         base::win::IsShiftPressed()));
   }
 
   return true;
 }
 
-bool ExternalTabContainerWin::CanDownload(RenderViewHost* render_view_host,
-                                          int request_id,
-                                          const std::string& request_method) {
+void ExternalTabContainerWin::CanDownload(
+    RenderViewHost* render_view_host,
+    int request_id,
+    const std::string& request_method,
+    const base::Callback<void(bool)>& callback) {
   if (load_requests_via_automation_) {
     if (automation_) {
       // In case the host needs to show UI that needs to take the focus.
       ::AllowSetForegroundWindow(ASFW_ANY);
 
       BrowserThread::PostTask(
           BrowserThread::IO, FROM_HERE,
           base::Bind(
              base::IgnoreResult(
                  &AutomationResourceMessageFilter::SendDownloadRequestToHost),
              automation_resource_message_filter_.get(), 0, tab_handle_,
              request_id));
     }
   } else {
     DLOG(WARNING) << "Downloads are only supported with host browser network "
                      "stack enabled.";
   }
 
   // Never allow downloads.
-  return false;
+  callback.Run(false);
 }
 
 void ExternalTabContainerWin::RegisterRenderViewHostForAutomation(
     RenderViewHost* render_view_host,
     bool pending_view) {
   if (render_view_host) {
     AutomationResourceMessageFilter::RegisterRenderView(
         render_view_host->GetProcess()->GetID(),
         render_view_host->GetRoutingID(),
         GetTabHandle(),
@@ skipping 597 matching lines @@
   if (params.disposition == CURRENT_TAB) {
     DCHECK(route_all_top_level_navigations_);
     forward_params.disposition = NEW_FOREGROUND_TAB;
   }
   WebContents* new_contents =
       ExternalTabContainerWin::OpenURLFromTab(source, forward_params);
   // support only one navigation for a dummy tab before it is killed.
   widget_->CloseNow();
   return new_contents;
 }