Add LayoutTests for URL list of Response

third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp

Index: third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp b/third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp
index 7c9918f328211e267b5bba8c82c26537d3927077..e8e7b98a69c68b6c626fd23903c7496e28008277 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp
+++ b/third_party/WebKit/Source/modules/fetch/FetchResponseData.cpp
@@ -194,6 +194,13 @@ void FetchResponseData::setURLList(const Vector<KURL>& urlList) {
   m_urlList = urlList;
 }
 
+const Vector<KURL>& FetchResponseData::internalURLList() const {
+  if (m_internalResponse) {
+    return m_internalResponse->m_urlList;
+  }
+  return m_urlList;
+}
+
 FetchResponseData* FetchResponseData::clone(ScriptState* scriptState) {
   FetchResponseData* newResponse = create();
   newResponse->m_type = m_type;