Mac Overlays: Add sandwich strategy

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 7ceaa00379f15a96de8b2afcad91ac6367c1a040..90708af07b0ef835514a83871616b7bd8ace71d7 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -224,8 +224,10 @@ void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
   // If we have any copy requests, we can't remove any quads for overlays,
   // otherwise the framebuffer will be missing the overlay contents.
   if (root_render_pass->copy_requests.empty()) {
-    overlay_processor_->ProcessForOverlays(render_passes_in_draw_order,
-                                           &frame.overlay_list);
+    OverlayProcessor::RendererState renderer_state;
+    renderer_state.device_scale_factor = device_scale_factor;
+    overlay_processor_->ProcessForOverlays(
+        renderer_state, render_passes_in_draw_order, &frame.overlay_list);
   }
 
   for (size_t i = 0; i < render_passes_in_draw_order->size(); ++i) {