[downloads] Set initiator when handling downloads via a[download]

third_party/WebKit/Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 403 matching lines @@
         policy, completedURL, document().outgoingReferrer()));
   }
 
   if (hasAttribute(downloadAttr)) {
     request.setRequestContext(WebURLRequest::RequestContextDownload);
     bool isSameOrigin =
         completedURL.protocolIsData() ||
         document().getSecurityOrigin()->canRequest(completedURL);
     const AtomicString& suggestedName =
         (isSameOrigin ? fastGetAttribute(downloadAttr) : nullAtom);
+    request.setRequestorOrigin(SecurityOrigin::create(document().url()));
 
     frame->loader().client()->loadURLExternally(
         request, NavigationPolicyDownload, suggestedName, false);
   } else {
     request.setRequestContext(WebURLRequest::RequestContextHyperlink);
     FrameLoadRequest frameRequest(&document(), request,
                                   getAttribute(targetAttr));
     frameRequest.setTriggeringEvent(event);
     if (hasRel(RelationNoReferrer)) {
       frameRequest.setShouldSendReferrer(NeverSendReferrer);
@@ skipping 40 matching lines @@
 }
 
 HTMLAnchorElement::NavigationHintSender*
 HTMLAnchorElement::ensureNavigationHintSender() {
   if (!m_navigationHintSender)
     m_navigationHintSender = NavigationHintSender::create(this);
   return m_navigationHintSender;
 }
 
 }  // namespace blink