Add loadedNonEmptyDocument flag in iframe for Resource Timing

Source/core/loader/cache/CachedResourceLoader.cpp

Index: Source/core/loader/cache/CachedResourceLoader.cpp
diff --git a/Source/core/loader/cache/CachedResourceLoader.cpp b/Source/core/loader/cache/CachedResourceLoader.cpp
index 17f5fa6349b98c8745b4f159fa697439e6bd3df6..1bc1070705248b024b44b16c885bc4a5096617d6 100644
--- a/Source/core/loader/cache/CachedResourceLoader.cpp
+++ b/Source/core/loader/cache/CachedResourceLoader.cpp
@@ -600,9 +600,10 @@ void CachedResourceLoader::storeResourceTimingInitiatorInformation(const CachedR
 {
     if (resource->type() == CachedResource::MainResource) {
         // <iframe>s should report the initial navigation requested by the parent document, but not subsequent navigations.
-        if (frame()->ownerElement() && m_documentLoader->frameLoader()->stateMachine()->committingFirstRealLoad()) {
+        if (frame()->ownerElement() && !frame()->ownerElement()->loadedNonEmptyDocument()) {
             InitiatorInfo info = { frame()->ownerElement()->localName(), monotonicallyIncreasingTime() };
             m_initiatorMap.add(resource.get(), info);
+            frame()->ownerElement()->didLoadNonEmptyDocument();
         }
     } else {
         InitiatorInfo info = { request.initiatorName(), monotonicallyIncreasingTime() };