Move h264_profile_level_id and vp9_profile to api/video_codecs

This is a refactor to simplify a follow-up CL of adding
SdpVideoFormat::IsSameCodec.

The original files media/base/h264_profile_level_id.* and
media/base/vp9_profile.h must be kept until downstream projects
stop using them.

Bug: chroimium:1187565
Change-Id: Ib39eca095a3d61939a914d9bffaf4b891ddd222f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215236
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Johannes Kron <kron@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33782}
diff --git a/api/video_codecs/vp9_profile.h b/api/video_codecs/vp9_profile.h
new file mode 100644
index 0000000..e632df4
--- /dev/null
+++ b/api/video_codecs/vp9_profile.h
@@ -0,0 +1,53 @@
+/*
+ *  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,
+};
+
+// 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_