[ServiceWorker] Add wasFetchedViaServiceWorker flag to WebURLResponse and ResourceResponse.

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index ffa23755e91fc6a30bba9aeb5d175926602b9e1a..df769ba7e865d4d354310cb5d0fe762367ecda77 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -1290,6 +1290,7 @@ void ResourceFetcher::willSendRequest(unsigned long identifier, ResourceRequest&
 
 void ResourceFetcher::didReceiveResponse(const Resource* resource, const ResourceResponse& response)
 {
+    // FIXME: When response.wasFetchedViaServiceWorker() is true, we need to check the URL of the responce for CSP and CORS.
     context().dispatchDidReceiveResponse(m_documentLoader, resource->identifier(), response, resource->loader());
 }