Expose GetLastCommitedOrigin() on WebContents and use it in about:blank

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 27a226f75bb71d1735f87fcc92dbe6362e16c32b..f39619a78372be6b0e5648c3502ca25db7ac7aca 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -529,6 +529,7 @@ WebContentsImpl* WebContentsImpl::CreateWithOpener(
     new_contents->is_subframe_ = true;
   }
   new_contents->Init(params);
+
   return new_contents;
 }
 
@@ -717,6 +718,10 @@ const GURL& WebContentsImpl::GetLastCommittedURL() const {
   return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
 }
 
+const url::Origin& WebContentsImpl::GetLastCommittedOrigin() const {
+  return frame_tree_.root()->current_replication_state().origin;
+}
+
 WebContentsDelegate* WebContentsImpl::GetDelegate() {
   return delegate_;
 }