Not for review.

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 5f443eefa531a48cecaaa34e07acde27de178392..2fdf6f2b51651dd6d53fec6393e90ecd748fa2a9 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -2133,6 +2133,11 @@ void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
   }
   output_surface_->SwapBuffers(&compositor_frame);
 
+  if (!metadata.overlay_position.IsEmpty()) {
+    context_support_->SetOverlayPlane(
+        1, metadata.overlay_texture_id_, metadata.overlay_position);
+  }
+
   swap_buffer_rect_ = gfx::Rect();
 
   // We don't have real fences, so we mark read fences as passed