Intersection Observer support for OOPIF

third_party/WebKit/public/web/WebWidget.h

Index: third_party/WebKit/public/web/WebWidget.h
diff --git a/third_party/WebKit/public/web/WebWidget.h b/third_party/WebKit/public/web/WebWidget.h
index b5b544caff73dfcfbdbc8dd1ad3b930de2ecaacd..872fe873c58719cece858b37f2fbd6ad70032d17 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -262,6 +262,11 @@ class WebWidget {
   // 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&, const WebPoint&) {}
+
  protected:
   ~WebWidget() {}
 };