PlzNavigate: preserve SourceLocation when navigating

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 143 matching lines @@
   DocumentLoader::detachFromFrame();
   m_extraData.reset();
 }
 
 void WebDataSourceImpl::setSubresourceFilter(
     WebDocumentSubresourceFilter* subresourceFilter) {
   DocumentLoader::setSubresourceFilter(
       SubresourceFilter::create(this, WTF::wrapUnique(subresourceFilter)));
 }
 
+void WebDataSourceImpl::setSourceLocation(
+    const WebSourceLocation& sourceLocation) {
+  std::unique_ptr<SourceLocation> location =
+      SourceLocation::create(sourceLocation.url, sourceLocation.lineNumber,
+                             sourceLocation.columnNumber, nullptr);
+  DocumentLoader::setSourceLocation(std::move(location));
+}
+
+void WebDataSourceImpl::resetSourceLocation() {
+  DocumentLoader::setSourceLocation(nullptr);
+}
+
 DEFINE_TRACE(WebDataSourceImpl) {
   DocumentLoader::trace(visitor);
 }
 
 }  // namespace blink