Intersection Observer support for OOPIF

third_party/WebKit/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 213 matching lines @@
   // composition. Returns false if there is no focused input or any ongoing
   // composition.
   virtual bool getCompositionCharacterBounds(WebVector<WebRect>& bounds) {
     return false;
   }
 
   // Applies the range on the focused frame so that the text will later be
   // replaced.
   virtual void applyReplacementRange(const WebRange&) {}
 
+  // Constrains the viewport intersection for use by IntersectionObserver.
+  // This is needed for out-of-process iframes to know if they are clipped
+  // by ancestor frames in another process.
+  virtual void setRemoteViewportIntersection(const WebRect&) {}

[dcheng, 2017/01/05 07:10:20]

Should we add this directly on WebFrameWidget instead? There doesn't seem to be
a valid case for sending it to any other type of widget.

[kenrb, 2017/01/09 19:31:20]

Done.

+
  protected:
   ~WebWidget() {}
 };
 
 }  // namespace blink
 
 #endif