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diff --git a/third_party/libwebrtc/test/fake_encoded_frame.h b/third_party/libwebrtc/test/fake_encoded_frame.h
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+++ b/third_party/libwebrtc/test/fake_encoded_frame.h
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2022 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 TEST_FAKE_ENCODED_FRAME_H_
+#define TEST_FAKE_ENCODED_FRAME_H_
+
+#include <memory>
+#include <ostream>  // no-presubmit-check TODO(webrtc:8982)
+#include <vector>
+
+#include "api/rtp_packet_infos.h"
+#include "api/video/encoded_frame.h"
+#include "api/video/video_rotation.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+// For test printing.
+void PrintTo(const EncodedFrame& frame,
+             std::ostream* os);  // no-presubmit-check TODO(webrtc:8982)
+
+namespace test {
+
+class FakeEncodedFrame : public EncodedFrame {
+ public:
+  // Always 10ms delay and on time.
+  int64_t ReceivedTime() const override;
+  int64_t RenderTime() const override;
+
+  // Setters for protected variables.
+  void SetReceivedTime(int64_t received_time);
+  void SetPayloadType(int payload_type);
+
+ private:
+  int64_t received_time_;
+};
+
+MATCHER_P(WithId, id, "") {
+  return ::testing::Matches(::testing::Eq(id))(arg.Id());
+}
+
+MATCHER_P(FrameWithSize, id, "") {
+  return ::testing::Matches(::testing::Eq(id))(arg.size());
+}
+
+MATCHER_P(RtpTimestamp, ts, "") {
+  return ts == arg.Timestamp();
+}
+
+class FakeFrameBuilder {
+ public:
+  FakeFrameBuilder& Time(uint32_t rtp_timestamp);
+  FakeFrameBuilder& Id(int64_t frame_id);
+  FakeFrameBuilder& AsLast();
+  FakeFrameBuilder& Refs(const std::vector<int64_t>& references);
+  FakeFrameBuilder& PlayoutDelay(VideoPlayoutDelay playout_delay);
+  FakeFrameBuilder& SpatialLayer(int spatial_layer);
+  FakeFrameBuilder& ReceivedTime(Timestamp receive_time);
+  FakeFrameBuilder& Size(size_t size);
+  FakeFrameBuilder& PayloadType(int payload_type);
+  FakeFrameBuilder& NtpTime(Timestamp ntp_time);
+  FakeFrameBuilder& Rotation(VideoRotation rotation);
+  FakeFrameBuilder& PacketInfos(RtpPacketInfos packet_infos);
+  std::unique_ptr<FakeEncodedFrame> Build();
+
+ private:
+  absl::optional<uint32_t> rtp_timestamp_;
+  absl::optional<int64_t> frame_id_;
+  absl::optional<VideoPlayoutDelay> playout_delay_;
+  absl::optional<int> spatial_layer_;
+  absl::optional<Timestamp> received_time_;
+  absl::optional<int> payload_type_;
+  absl::optional<Timestamp> ntp_time_;
+  absl::optional<VideoRotation> rotation_;
+  absl::optional<RtpPacketInfos> packet_infos_;
+  std::vector<int64_t> references_;
+  bool last_spatial_layer_ = false;
+  size_t size_ = 10;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_FAKE_ENCODED_FRAME_H_