Expose the initiating origin/URL of a navigation in the Blink public API

third_party/WebKit/Source/web/WebDataSourceImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "public/platform/WebVector.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 WebDataSourceImpl* WebDataSourceImpl::create(
     LocalFrame* frame,
     const ResourceRequest& request,
     const SubstituteData& data,
-    ClientRedirectPolicy clientRedirectPolicy) {
-  return new WebDataSourceImpl(frame, request, data, clientRedirectPolicy);
+    ClientRedirectPolicy clientRedirectPolicy,
+    Document* requestorDocument) {
+  return new WebDataSourceImpl(frame, request, data, clientRedirectPolicy,
+                               requestorDocument);
+}
+
+WebURL WebDataSourceImpl::requestorURL() const {
+  return m_requestorDocument->url();
 }
 
 const WebURLRequest& WebDataSourceImpl::originalRequest() const {
   return m_originalRequestWrapper;
 }
 
 const WebURLRequest& WebDataSourceImpl::request() const {
   return m_requestWrapper;
 }
 
@@ skipping 73 matching lines @@
       return WebNavigationTypeFormResubmitted;
     case NavigationTypeOther:
     default:
       return WebNavigationTypeOther;
   }
 }
 
 WebDataSourceImpl::WebDataSourceImpl(LocalFrame* frame,
                                      const ResourceRequest& request,
                                      const SubstituteData& data,
-                                     ClientRedirectPolicy clientRedirectPolicy)
+                                     ClientRedirectPolicy clientRedirectPolicy,
+                                     Document* requestorDocument)
     : DocumentLoader(frame, request, data, clientRedirectPolicy),
+      m_requestorDocument(requestorDocument),
       m_originalRequestWrapper(DocumentLoader::originalRequest()),
       m_requestWrapper(DocumentLoader::request()),
       m_responseWrapper(DocumentLoader::response()) {}
 
 WebDataSourceImpl::~WebDataSourceImpl() {
   // Verify that detachFromFrame() has been called.
   DCHECK(!m_extraData);
 }
 
 void WebDataSourceImpl::detachFromFrame() {
   DocumentLoader::detachFromFrame();
   m_extraData.reset();
 }
 
 void WebDataSourceImpl::setSubresourceFilter(
     WebDocumentSubresourceFilter* subresourceFilter) {
   DocumentLoader::setSubresourceFilter(WTF::wrapUnique(subresourceFilter));
 }
 
 DEFINE_TRACE(WebDataSourceImpl) {
   DocumentLoader::trace(visitor);
+  visitor->trace(m_requestorDocument);
 }
 
 }  // namespace blink