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 9b0023a1deefcecd93e08c4ae77a69b90c2ab28d..2c03e6b835c7f2874b36efe2d2d5f8f2ab05e4f8 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -203,7 +203,7 @@ enum DocumentClass {
 using DocumentClassFlags = unsigned char;
 
 class CORE_EXPORT Document : public ContainerNode, public TreeScope, public SecurityContext, public ExecutionContext
-    , public WillBeHeapSupplementable<Document>, public DocumentLifecycleNotifier {
+    , public WillBeHeapSupplementable<Document>, public DocumentLifecycleNotifier, public DocumentTiming::Observer {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Document);
 public:
@@ -918,6 +918,7 @@ public:
     PassRefPtrWillBeRawPtr<TouchList> createTouchList(WillBeHeapVector<RefPtrWillBeMember<Touch>>&) const;
 
     const DocumentTiming& timing() const { return m_documentTiming; }
+    void onDocumentTimingChanged() const;
 
     int requestAnimationFrame(FrameRequestCallback*);
     void cancelAnimationFrame(int id);