Update Clear Key to support keyids formatted init_data

media/cdm/json_web_key.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CDM_JSON_WEB_KEY_H_
 #define MEDIA_CDM_JSON_WEB_KEY_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 49 matching lines @@
 MEDIA_EXPORT std::string GenerateJWKSet(const uint8* key, int key_length,
                                         const uint8* key_id, int key_id_length);
 
 // Extracts the JSON Web Keys from a JSON Web Key Set. If |input| looks like
 // a valid JWK Set, then true is returned and |keys| and |session_type| are
 // updated to contain the values found. Otherwise return false.
 MEDIA_EXPORT bool ExtractKeysFromJWKSet(const std::string& jwk_set,
                                         KeyIdAndKeyPairs* keys,
                                         MediaKeys::SessionType* session_type);
 
+// Extracts the Key Ids from a Key IDs Initialization Data
+// (https://w3c.github.io/encrypted-media/keyids-format.html). If |input| looks
+// valid, then true is returned and |key_ids| is updated to contain the values
+// found. Otherwise return false and |error_message| contains the reason.
+MEDIA_EXPORT bool ExtractKeyIdsFromKeyIdsInitData(const std::string& input,
+                                                  KeyIdList* key_ids,
+                                                  std::string* error_message);
+
 // Creates a license request message for the |key_ids| and |session_type|
 // specified. |license| is updated to contain the resulting JSON string.
 MEDIA_EXPORT void CreateLicenseRequest(const KeyIdList& key_ids,
                                        MediaKeys::SessionType session_type,
                                        std::vector<uint8>* license);
 
 // Extract the first key from the license request message. Returns true if
 // |license| is a valid license request and contains at least one key,
 // otherwise false and |first_key| is not touched.
 MEDIA_EXPORT bool ExtractFirstKeyIdFromLicenseRequest(
     const std::vector<uint8>& license,
     std::vector<uint8>* first_key);
 
 }  // namespace media
 
 #endif  // MEDIA_CDM_JSON_WEB_KEY_H_