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diff --git a/third_party/libwebrtc/api/video_codecs/vp9_profile.h b/third_party/libwebrtc/api/video_codecs/vp9_profile.h
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+++ b/third_party/libwebrtc/api/video_codecs/vp9_profile.h
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+/*
+ *  Copyright (c) 2021 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 API_VIDEO_CODECS_VP9_PROFILE_H_
+#define API_VIDEO_CODECS_VP9_PROFILE_H_
+
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// Profile information for VP9 video.
+extern RTC_EXPORT const char kVP9FmtpProfileId[];
+
+enum class VP9Profile {
+  kProfile0,
+  kProfile1,
+  kProfile2,
+  kProfile3,
+};
+
+// Helper functions to convert VP9Profile to std::string. Returns "0" by
+// default.
+RTC_EXPORT std::string VP9ProfileToString(VP9Profile profile);
+
+// Helper functions to convert std::string to VP9Profile. Returns null if given
+// an invalid profile string.
+absl::optional<VP9Profile> StringToVP9Profile(const std::string& str);
+
+// Parse profile that is represented as a string of single digit contained in an
+// SDP key-value map. A default profile(kProfile0) will be returned if the
+// profile key is missing. Nothing will be returned if the key is present but
+// the string is invalid.
+RTC_EXPORT absl::optional<VP9Profile> ParseSdpForVP9Profile(
+    const SdpVideoFormat::Parameters& params);
+
+// Returns true if the parameters have the same VP9 profile, or neither contains
+// VP9 profile.
+bool VP9IsSameProfile(const SdpVideoFormat::Parameters& params1,
+                      const SdpVideoFormat::Parameters& params2);
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_CODECS_VP9_PROFILE_H_