Move headers from src/experimental/usd to include/experimental/usd

PiperOrigin-RevId: 775269423
Change-Id: Ifca6c3ead32b9fb3f02784ed38a9efae300be410

include/mujoco/experimental/usd/layer_sink.h

@@ -0,0 +1,41 @@
+// Copyright 2025 DeepMind Technologies Limited
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MUJOCO_SRC_EXPERIMENTAL_USD_LAYER_SINK_H_
+#define MUJOCO_SRC_EXPERIMENTAL_USD_LAYER_SINK_H_
+
+#include <vector>
+
+#include <mujoco/mujoco.h>
+#include <pxr/usd/sdf/path.h>
+#include <pxr/usd/usd/common.h>
+
+namespace mujoco {
+namespace usd {
+
+// A sink for writing pose data to an SDF layer.
+// Opinions will be authored on the edit target layer for the
+// passed stage argument.
+class LayerSink {
+ public:
+  explicit LayerSink(pxr::UsdStageRefPtr stage);
+  void Update(const mjData* const data, std::vector<pxr::SdfPath> body_paths_);
+
+ private:
+  pxr::UsdStageRefPtr stage_;
+};
+}  // namespace usd
+}  // namespace mujoco
+
+#endif  // MUJOCO_SRC_EXPERIMENTAL_USD_LAYER_SINK_H_