Blink changes to record interest rects for http://w3c.github.io/frame-timing/

public/web/WebWidget.h

Index: public/web/WebWidget.h
diff --git a/public/web/WebWidget.h b/public/web/WebWidget.h
index 691715e22835e4cf949acccb790e251aa9a58433..bbc7e61707bb45623ffafa468892b0717b85f13f 100644
--- a/public/web/WebWidget.h
+++ b/public/web/WebWidget.h
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ -160,6 +161,14 @@ public:
         float scaleFactor,
         float topControlsShownRatioDelta) { }
 
+    // Records composite or render events for the Performance Timeline.
+    // See http://w3c.github.io/frame-timing/ for definition of terms.
+    enum FrameTimingEventType {
+        CompositeEvent,
+        RenderEvent,
+    };
+    virtual void recordFrameTimingEvent(FrameTimingEventType eventType, int64_t RectId, const WebVector<std::tuple<int, double, double>>& events) { }
+
     // Called to inform the WebWidget that mouse capture was lost.
     virtual void mouseCaptureLost() { }