[ServiceWorker] Add wasFetchedViaServiceWorker flag to WebURLResponse and ResourceResponse.

Source/platform/exported/WebURLResponse.cpp

Index: Source/platform/exported/WebURLResponse.cpp
diff --git a/Source/platform/exported/WebURLResponse.cpp b/Source/platform/exported/WebURLResponse.cpp
index e75d4f8ecafb5e309aca2d6fbe457e5d7c46a32d..4c2baf1eddd444f782c4abe6e649bb3886842cd1 100644
--- a/Source/platform/exported/WebURLResponse.cpp
+++ b/Source/platform/exported/WebURLResponse.cpp
@@ -378,6 +378,16 @@ void WebURLResponse::setWasFetchedViaProxy(bool value)
     m_private->m_resourceResponse->setWasFetchedViaProxy(value);
 }
 
+bool WebURLResponse::wasFetchedViaServiceWorker() const
+{
+    return m_private->m_resourceResponse->wasFetchedViaServiceWorker();
+}
+
+void WebURLResponse::setWasFetchedViaServiceWorker(bool value)
+{
+    m_private->m_resourceResponse->setWasFetchedViaServiceWorker(value);
+}
+
 bool WebURLResponse::isMultipartPayload() const
 {
     return m_private->m_resourceResponse->isMultipartPayload();