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

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 142 matching lines @@
 
     // Applies viewport related properties during a commit from the compositor
     // thread.
     virtual void applyViewportDeltas(
         const WebFloatSize& pinchViewportDelta,
         const WebFloatSize& mainFrameDelta,
         const WebFloatSize& elasticOverscrollDelta,
         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::pair<int, double>>& events) { }
+
     // Called to inform the WebWidget that mouse capture was lost.
     virtual void mouseCaptureLost() { }
 
     // Called to inform the WebWidget that it has gained or lost keyboard focus.
     virtual void setFocus(bool) { }
 
     // Called to inform the WebWidget of a new composition text.
     // If selectionStart and selectionEnd has the same value, then it indicates
     // the input caret position. If the text is empty, then the existing
     // composition text will be cancelled.
@@ skipping 106 matching lines @@
     // control what are valid states for top controls and if it should animate.
     virtual void updateTopControlsState(WebTopControlsState constraints, WebTopControlsState current, bool animate) { }
 
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif