Don't delete CopyOutputRequests when queueing a new Surface frame.

cc/surfaces/surface_aggregator.cc

Index: cc/surfaces/surface_aggregator.cc
diff --git a/cc/surfaces/surface_aggregator.cc b/cc/surfaces/surface_aggregator.cc
index fd51529b35923581504757f67c2fd139d701c78f..7d2a86bbadcceb33c3b9489cc88273d9cc9a3f68 100644
--- a/cc/surfaces/surface_aggregator.cc
+++ b/cc/surfaces/surface_aggregator.cc
@@ -710,6 +710,12 @@ gfx::Rect SurfaceAggregator::PrewalkTree(const SurfaceId& surface_id,
   }
 
   CHECK(debug_weak_this.get());
+  if (surface->HasRootCopyRequests() && !frame.render_pass_list.empty()) {
+    int remapped_pass_id =
+        RemapPassId(frame.render_pass_list.back()->id, surface_id);
+    copy_request_passes_.insert(remapped_pass_id);
+  }
+
   for (const auto& render_pass : frame.render_pass_list) {
     if (!render_pass->copy_requests.empty()) {
       int remapped_pass_id = RemapPassId(render_pass->id, surface_id);
@@ -740,7 +746,7 @@ void SurfaceAggregator::CopyUndrawnSurfaces(PrewalkResult* prewalk_result) {
     if (!surface->HasActiveFrame())
       continue;
     const CompositorFrame& frame = surface->GetActiveFrame();
-    bool surface_has_copy_requests = false;
+    bool surface_has_copy_requests = surface->HasRootCopyRequests();
     for (const auto& render_pass : frame.render_pass_list) {
       surface_has_copy_requests |= !render_pass->copy_requests.empty();
     }