List all child surfaces (including occluded) in CompositorFrame

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 0ce5d0e0cf526aa3885d15b1aba47b2cf9d0584c..201ca3378d623715c0718c5851b5f8985dae3750 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -43,6 +43,7 @@
 #include "cc/layers/painted_scrollbar_layer_impl.h"
 #include "cc/layers/render_surface_impl.h"
 #include "cc/layers/scrollbar_layer_impl_base.h"
+#include "cc/layers/surface_layer_impl.h"
 #include "cc/layers/viewport.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/copy_output_request.h"
@@ -1577,6 +1578,10 @@ CompositorFrameMetadata LayerTreeHostImpl::MakeCompositorFrameMetadata() const {
         !OuterViewportScrollLayer()->user_scrollable_vertical();
   }
 
+  for (LayerImpl* surface_layer : active_tree_->SurfaceLayers()) {
+    metadata.referenced_surfaces.push_back(
+        static_cast<SurfaceLayerImpl*>(surface_layer)->surface_id());
+  }
   if (!InnerViewportScrollLayer())
     return metadata;