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diff --git a/third_party/libwebrtc/modules/video_coding/svc/scalability_structure_test_helpers.h b/third_party/libwebrtc/modules/video_coding/svc/scalability_structure_test_helpers.h
new file mode 100644
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+++ b/third_party/libwebrtc/modules/video_coding/svc/scalability_structure_test_helpers.h
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_
+#define MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "api/array_view.h"
+#include "api/transport/rtp/dependency_descriptor.h"
+#include "api/video/video_bitrate_allocation.h"
+#include "common_video/generic_frame_descriptor/generic_frame_info.h"
+#include "modules/video_coding/chain_diff_calculator.h"
+#include "modules/video_coding/frame_dependencies_calculator.h"
+#include "modules/video_coding/svc/scalable_video_controller.h"
+
+namespace webrtc {
+
+// Creates bitrate allocation with non-zero bitrate for given number of temporal
+// layers for each spatial layer.
+VideoBitrateAllocation EnableTemporalLayers(int s0, int s1 = 0, int s2 = 0);
+
+class ScalabilityStructureWrapper {
+ public:
+  explicit ScalabilityStructureWrapper(ScalableVideoController& structure)
+      : structure_controller_(structure) {}
+
+  std::vector<GenericFrameInfo> GenerateFrames(int num_temporal_units) {
+    std::vector<GenericFrameInfo> frames;
+    GenerateFrames(num_temporal_units, frames);
+    return frames;
+  }
+  void GenerateFrames(int num_temporal_units,
+                      std::vector<GenericFrameInfo>& frames);
+
+  // Returns false and ADD_FAILUREs for frames with invalid references.
+  // In particular validates no frame frame reference to frame before frames[0].
+  // In error messages frames are indexed starting with 0.
+  bool FrameReferencesAreValid(
+      rtc::ArrayView<const GenericFrameInfo> frames) const;
+
+ private:
+  ScalableVideoController& structure_controller_;
+  FrameDependenciesCalculator frame_deps_calculator_;
+  ChainDiffCalculator chain_diff_calculator_;
+  int64_t frame_id_ = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_