cc: Rationalize sync points and lost status for returned resources

cc/layers/delegated_frame_resource_collection.cc

Index: cc/layers/delegated_frame_resource_collection.cc
diff --git a/cc/layers/delegated_frame_resource_collection.cc b/cc/layers/delegated_frame_resource_collection.cc
index 5ca4eda57d761bed7998ae75964a136c979ddae9..59f9f4f40075bd4f5b3f65aa7c42c2513d7771bf 100644
--- a/cc/layers/delegated_frame_resource_collection.cc
+++ b/cc/layers/delegated_frame_resource_collection.cc
@@ -88,9 +88,14 @@ void DelegatedFrameResourceCollection::UnrefResources(
     DCHECK(it != resource_id_ref_count_map_.end());
     DCHECK_GE(it->second.refs_to_wait_for, returned[i].count);
     it->second.refs_to_wait_for -= returned[i].count;
+    it->second.lost |= returned[i].lost;
+    if (returned[i].sync_point)
+      it->second.sync_point = returned[i].sync_point;
     if (it->second.refs_to_wait_for == 0) {
       to_return.push_back(returned[i]);
       to_return.back().count = it->second.refs_to_return;
+      to_return.back().sync_point = it->second.sync_point;
+      to_return.back().lost = it->second.lost;
       resource_id_ref_count_map_.erase(it);
     }
   }