PlzNavigate: preserve SourceLocation when navigating

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index f351ee6dc1ee5aa31edd66815b6a9ff97cd231fb..d9d3d6b768e3efc3e19a6aa69e1f6ebc638169b2 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -235,6 +235,15 @@ void DocumentLoader::setServiceWorkerNetworkProvider(
   m_serviceWorkerNetworkProvider = std::move(provider);
 }
 
+void DocumentLoader::setSourceLocation(
+    std::unique_ptr<SourceLocation> sourceLocation) {
+  m_sourceLocation = std::move(sourceLocation);
+}
+
+std::unique_ptr<SourceLocation> DocumentLoader::copySourceLocation() const {
+  return m_sourceLocation ? m_sourceLocation->clone() : nullptr;
+}
+
 void DocumentLoader::dispatchLinkHeaderPreloads(
     ViewportDescriptionWrapper* viewport,
     LinkLoader::MediaPreloadPolicy mediaPolicy) {