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diff --git a/third_party/libwebrtc/media/base/test_utils.h b/third_party/libwebrtc/media/base/test_utils.h
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+/*
+ *  Copyright (c) 2004 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 MEDIA_BASE_TEST_UTILS_H_
+#define MEDIA_BASE_TEST_UTILS_H_
+
+#include <string>
+#include <vector>
+
+#include "media/base/media_channel.h"
+#include "media/base/video_common.h"
+#include "rtc_base/arraysize.h"
+
+namespace webrtc {
+class VideoFrame;
+}
+
+namespace cricket {
+
+// Returns size of 420 image with rounding on chroma for odd sizes.
+#define I420_SIZE(w, h) (w * h + (((w + 1) / 2) * ((h + 1) / 2)) * 2)
+// Returns size of ARGB image.
+#define ARGB_SIZE(w, h) (w * h * 4)
+
+template <class T>
+inline std::vector<T> MakeVector(const T a[], size_t s) {
+  return std::vector<T>(a, a + s);
+}
+#define MAKE_VECTOR(a) cricket::MakeVector(a, arraysize(a))
+
+// Checks whether `codecs` contains `codec`; checks using Codec::Matches().
+template <class C>
+bool ContainsMatchingCodec(const std::vector<C>& codecs,
+                           const C& codec,
+                           const webrtc::FieldTrialsView* field_trials) {
+  typename std::vector<C>::const_iterator it;
+  for (it = codecs.begin(); it != codecs.end(); ++it) {
+    if (it->Matches(codec, field_trials)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// Create Simulcast StreamParams with given `ssrcs` and `cname`.
+cricket::StreamParams CreateSimStreamParams(const std::string& cname,
+                                            const std::vector<uint32_t>& ssrcs);
+// Create Simulcast stream with given `ssrcs` and `rtx_ssrcs`.
+// The number of `rtx_ssrcs` must match number of `ssrcs`.
+cricket::StreamParams CreateSimWithRtxStreamParams(
+    const std::string& cname,
+    const std::vector<uint32_t>& ssrcs,
+    const std::vector<uint32_t>& rtx_ssrcs);
+
+// Create StreamParams with single primary SSRC and corresponding FlexFEC SSRC.
+cricket::StreamParams CreatePrimaryWithFecFrStreamParams(
+    const std::string& cname,
+    uint32_t primary_ssrc,
+    uint32_t flexfec_ssrc);
+
+}  // namespace cricket
+
+#endif  // MEDIA_BASE_TEST_UTILS_H_