Resource Timing: Use original Timing-Allow-Origin for cache validating

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 30d6de95f1c8e2aec4ed3e87d953d115c99ee33a..c890592cbdc2c3b80468cd713949fb664bf24c15 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -867,6 +867,12 @@ void ResourceFetcher::storeResourceTimingInitiatorInformation(Resource* resource
 
     RefPtr<ResourceTimingInfo> info = ResourceTimingInfo::create(resource->options().initiatorInfo.name, monotonicallyIncreasingTime());
 
+    if (resource->isCacheValidator()) {
+        const AtomicString& timingAllowOrigin = resource->resourceToRevalidate()->response().httpHeaderField("Timing-Allow-Origin");
+        if (!timingAllowOrigin.isEmpty())
+            info->setOriginalTimingAllowOrigin(timingAllowOrigin);
+    }
+
     if (resource->type() == Resource::MainResource) {
         // <iframe>s should report the initial navigation requested by the parent document, but not subsequent navigations.
         if (frame()->ownerElement() && !frame()->ownerElement()->loadedNonEmptyDocument()) {