Add workerReady timing for ServiceWorker controlled requests [3/3]

Source/core/timing/PerformanceResourceTiming.h

Index: Source/core/timing/PerformanceResourceTiming.h
diff --git a/Source/core/timing/PerformanceResourceTiming.h b/Source/core/timing/PerformanceResourceTiming.h
index 4ad3f79853fa7b5b571de8545658c474c7e28862..b76e5a91c09c20642ebdcd3c9fa5d141f8f3c0b3 100644
--- a/Source/core/timing/PerformanceResourceTiming.h
+++ b/Source/core/timing/PerformanceResourceTiming.h
@@ -78,6 +78,8 @@ private:
     PerformanceResourceTiming(const ResourceTimingInfo&, Document* requestingDocument, double startTime, double lastRedirectEndTime, bool m_allowTimingDetails, bool m_allowRedirectDetails);
     virtual ~PerformanceResourceTiming();
 
+    double workerReady() const;
+
     AtomicString m_initiatorType;
     RefPtrWillBeMember<Document> m_requestingDocument;
     RefPtr<ResourceLoadTiming> m_timing;