Intersection Observer support for OOPIF

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index ad847c86a3ddd8b1054489ea31f3c3c236bdabe6..2d0408341405f596a586aa77c14cba40d78865a3 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -520,6 +520,8 @@ bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ViewMsg_Move_ACK, OnRequestMoveAck)
     IPC_MESSAGE_HANDLER(ViewMsg_UpdateScreenRects, OnUpdateScreenRects)
     IPC_MESSAGE_HANDLER(ViewMsg_SetFrameSinkId, OnSetFrameSinkId)
+    IPC_MESSAGE_HANDLER(ViewMsg_SetViewportIntersection,
+                        OnSetViewportIntersection)
     IPC_MESSAGE_HANDLER(ViewMsg_WaitForNextFrameForTests,
                         OnWaitNextFrameForTests)
     IPC_MESSAGE_HANDLER(InputMsg_RequestCompositionUpdate,
@@ -1544,6 +1546,14 @@ void RenderWidget::OnSetFrameSinkId(const cc::FrameSinkId& frame_sink_id) {
     compositor_->SetFrameSinkId(frame_sink_id);
 }
 
+void RenderWidget::OnSetViewportIntersection(
+    const gfx::Rect& viewport_intersection,
+    const gfx::Point& root_offset) {
+  if (GetWebWidget())
+    GetWebWidget()->setRemoteViewportIntersection(viewport_intersection,
+                                                  root_offset);
+}
+
 void RenderWidget::OnHandleCompositorProto(const std::vector<uint8_t>& proto) {
   if (compositor_)
     compositor_->OnHandleCompositorProto(proto);