Intersection Observer support for OOPIF

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 40b54b69ced633e975d5e17b74ec67d2644bc2ad..58145c04f536d2f02a3798a774ac332fd38d638b 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -335,6 +335,14 @@ void RenderWidgetHostViewChildFrame::UnregisterFrameSinkId() {
   }
 }
 
+void RenderWidgetHostViewChildFrame::UpdateViewportIntersection(
+    const gfx::Rect& viewport_intersection,
+    const gfx::Point& root_offset) {
+  if (host_)
+    host_->Send(new ViewMsg_SetViewportIntersection(
+        host_->GetRoutingID(), viewport_intersection, root_offset));
+}
+
 void RenderWidgetHostViewChildFrame::GestureEventAck(
     const blink::WebGestureEvent& event,
     InputEventAckState ack_result) {