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 f5733a90c9863dfec5e3a37dc65adebf98e7e5c1..be3a191ae02e990aecc6d23063aa5c2fdd1f96a8 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -232,6 +232,11 @@ 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&) {}
+
  protected:
   ~WebWidget() {}
 };