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diff --git a/third_party/libwebrtc/modules/video_coding/utility/simulcast_test_fixture_impl.h b/third_party/libwebrtc/modules/video_coding/utility/simulcast_test_fixture_impl.h
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+/*
+ *  Copyright (c) 2018 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_UTILITY_SIMULCAST_TEST_FIXTURE_IMPL_H_
+#define MODULES_VIDEO_CODING_UTILITY_SIMULCAST_TEST_FIXTURE_IMPL_H_
+
+#include <memory>
+#include <vector>
+
+#include "api/test/mock_video_decoder.h"
+#include "api/test/mock_video_encoder.h"
+#include "api/test/simulcast_test_fixture.h"
+#include "api/video/i420_buffer.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/video_decoder_factory.h"
+#include "api/video_codecs/video_encoder_factory.h"
+#include "modules/video_coding/utility/simulcast_rate_allocator.h"
+
+namespace webrtc {
+namespace test {
+
+class SimulcastTestFixtureImpl final : public SimulcastTestFixture {
+ public:
+  SimulcastTestFixtureImpl(std::unique_ptr<VideoEncoderFactory> encoder_factory,
+                           std::unique_ptr<VideoDecoderFactory> decoder_factory,
+                           SdpVideoFormat video_format);
+  ~SimulcastTestFixtureImpl() final;
+
+  // Implements SimulcastTestFixture.
+  void TestKeyFrameRequestsOnAllStreams() override;
+  void TestKeyFrameRequestsOnSpecificStreams() override;
+  void TestPaddingAllStreams() override;
+  void TestPaddingTwoStreams() override;
+  void TestPaddingTwoStreamsOneMaxedOut() override;
+  void TestPaddingOneStream() override;
+  void TestPaddingOneStreamTwoMaxedOut() override;
+  void TestSendAllStreams() override;
+  void TestDisablingStreams() override;
+  void TestActiveStreams() override;
+  void TestSwitchingToOneStream() override;
+  void TestSwitchingToOneOddStream() override;
+  void TestSwitchingToOneSmallStream() override;
+  void TestSpatioTemporalLayers333PatternEncoder() override;
+  void TestSpatioTemporalLayers321PatternEncoder() override;
+  void TestStrideEncodeDecode() override;
+  void TestDecodeWidthHeightSet() override;
+  void TestEncoderInfoForDefaultTemporalLayerProfileHasFpsAllocation() override;
+
+  static void DefaultSettings(VideoCodec* settings,
+                              const int* temporal_layer_profile,
+                              VideoCodecType codec_type,
+                              bool reverse_layer_order = false);
+
+ private:
+  class TestEncodedImageCallback;
+  class TestDecodedImageCallback;
+
+  void SetUpCodec(const int* temporal_layer_profile);
+  void SetUpRateAllocator();
+  void SetRates(uint32_t bitrate_kbps, uint32_t fps);
+  void RunActiveStreamsTest(std::vector<bool> active_streams);
+  void UpdateActiveStreams(std::vector<bool> active_streams);
+  void ExpectStream(VideoFrameType frame_type, int scaleResolutionDownBy);
+  void ExpectStreams(VideoFrameType frame_type,
+                     std::vector<bool> expected_streams_active);
+  void ExpectStreams(VideoFrameType frame_type, int expected_video_streams);
+  void VerifyTemporalIdxAndSyncForAllSpatialLayers(
+      TestEncodedImageCallback* encoder_callback,
+      const int* expected_temporal_idx,
+      const bool* expected_layer_sync,
+      int num_spatial_layers);
+  void SwitchingToOneStream(int width, int height);
+
+  std::unique_ptr<VideoEncoder> encoder_;
+  MockEncodedImageCallback encoder_callback_;
+  std::unique_ptr<VideoDecoder> decoder_;
+  MockDecodedImageCallback decoder_callback_;
+  VideoCodec settings_;
+  rtc::scoped_refptr<I420Buffer> input_buffer_;
+  std::unique_ptr<VideoFrame> input_frame_;
+  std::unique_ptr<SimulcastRateAllocator> rate_allocator_;
+  VideoCodecType codec_type_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_UTILITY_SIMULCAST_TEST_FIXTURE_IMPL_H_