Observing DocumentTiming and sending data to RenderFrameImpl

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 5d158be110866d73f9a111a422297ff8df7f9eda..132a24482e870ec4ea1c3c2c02f23ca44e7e9305 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -1100,6 +1100,7 @@ private:
     void refExecutionContext() final { ref(); }
     void derefExecutionContext() final { deref(); }
 #endif
+    WeakPtrWillBeRawPtr<Document> weakReference();
 
     const KURL& virtualURL() const final; // Same as url(), but needed for ExecutionContext to implement it without a performance loss for direct calls.
     KURL virtualCompleteURL(const String&) const final; // Same as completeURL() for the same reason as above.