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 e09d004a0114f85342324be1d864034f50410e7b..359ba626b8c1d7824656d186e02a27c12dc24720 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -2130,6 +2130,11 @@ 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