Chrome EME Key Systems

(lldb) p g_key_systems.Pointer()
(media::KeySystemsImpl *) $3 = 0x00000001222553b0
(lldb) p *$3
(media::KeySystemsImpl) $4 = {
  key_system_map_ = size=2 {
    [0] = {
      __cc = {
        first = "org.w3.clearkey"
        second = {
          key_system = "org.w3.clearkey"
          supported_init_data_types = 7
          supported_codecs = 63
          max_audio_robustness = EMPTY
          max_video_robustness = EMPTY
          persistent_license_support = NOT_SUPPORTED
          persistent_release_message_support = NOT_SUPPORTED
          persistent_state_support = NOT_SUPPORTED
          distinctive_identifier_support = NOT_SUPPORTED
          use_aes_decryptor = true
          pepper_type = ""
        }
      }
      __nc = {
        first = "org.w3.clearkey"
        second = {
          key_system = "org.w3.clearkey"
          supported_init_data_types = 7
          supported_codecs = 63
          max_audio_robustness = EMPTY
          max_video_robustness = EMPTY
          persistent_license_support = 1
          persistent_release_message_support = 1
          persistent_state_support = NOT_SUPPORTED
          distinctive_identifier_support = NOT_SUPPORTED
          use_aes_decryptor = true
          pepper_type = ""
        }
      }
    }
    [1] = {
      __cc = {
        first = "com.widevine.alpha"
        second = {
          key_system = "com.widevine.alpha"
          supported_init_data_types = 3
          supported_codecs = 63
          max_audio_robustness = SW_SECURE_CRYPTO
          max_video_robustness = SW_SECURE_DECODE
          persistent_license_support = 1
          persistent_release_message_support = 1
          persistent_state_support = REQUESTABLE
          distinctive_identifier_support = NOT_SUPPORTED
          use_aes_decryptor = false
          pepper_type = "application/x-ppapi-widevine-cdm"
        }
      }
      __nc = {
        first = "com.widevine.alpha"
        second = {
          key_system = "com.widevine.alpha"
          supported_init_data_types = 3
          supported_codecs = 63
          max_audio_robustness = SW_SECURE_CRYPTO
          max_video_robustness = SW_SECURE_DECODE
          persistent_license_support = 1
          persistent_release_message_support = 1
          persistent_state_support = REQUESTABLE
          distinctive_identifier_support = NOT_SUPPORTED
          use_aes_decryptor = false
          pepper_type = "application/x-ppapi-widevine-cdm"
        }
      }
    }
  }
  mime_type_to_codec_mask_map_ = size=4 {
    [0] = {
      __cc = (first = "video/mp4", second = 32)
      __nc = (first = "video/mp4", second = 32)
    }
    [1] = {
      __cc = (first = "audio/mp4", second = 16)
      __nc = (first = "audio/mp4", second = 16)
    }
    [2] = {
      __cc = (first = "video/webm", second = 12)
      __nc = (first = "video/webm", second = 12)
    }
    [3] = {
      __cc = (first = "audio/webm", second = 3)
      __nc = (first = "audio/webm", second = 3)
    }
  }
  codec_string_map_ = size=9 {
    [0] = {
      __cc = (first = "avc3", second = EME_CODEC_MP4_AVC1)
      __nc = (first = "avc3", second = EME_CODEC_MP4_AVC1)
    }
    [1] = {
      __cc = (first = "avc1", second = EME_CODEC_MP4_AVC1)
      __nc = (first = "avc1", second = EME_CODEC_MP4_AVC1)
    }
    [2] = {
      __cc = (first = "vp9", second = EME_CODEC_WEBM_VP9)
      __nc = (first = "vp9", second = EME_CODEC_WEBM_VP9)
    }
    [3] = {
      __cc = (first = "vp9.0", second = EME_CODEC_WEBM_VP9)
      __nc = (first = "vp9.0", second = EME_CODEC_WEBM_VP9)
    }
    [4] = {
      __cc = (first = "vp8.0", second = EME_CODEC_WEBM_VP8)
      __nc = (first = "vp8.0", second = EME_CODEC_WEBM_VP8)
    }
    [5] = {
      __cc = (first = "mp4a", second = EME_CODEC_MP4_AAC)
      __nc = (first = "mp4a", second = EME_CODEC_MP4_AAC)
    }
    [6] = {
      __cc = (first = "vorbis", second = EME_CODEC_WEBM_VORBIS)
      __nc = (first = "vorbis", second = EME_CODEC_WEBM_VORBIS)
    }
    [7] = {
      __cc = (first = "vp8", second = EME_CODEC_WEBM_VP8)
      __nc = (first = "vp8", second = EME_CODEC_WEBM_VP8)
    }
    [8] = {
      __cc = (first = "opus", second = EME_CODEC_WEBM_OPUS)
      __nc = (first = "opus", second = EME_CODEC_WEBM_OPUS)
    }
  }
  key_system_name_for_uma_map_ = size=2 {
    [0] = {
      __cc = (first = "org.w3.clearkey", second = "ClearKey")
      __nc = (first = "org.w3.clearkey", second = "ClearKey")
    }
    [1] = {
      __cc = (first = "com.widevine.alpha", second = "Widevine")
      __nc = (first = "com.widevine.alpha", second = "Widevine")
    }
  }
  audio_codec_mask_ = 19
  video_codec_mask_ = 44
  thread_checker_ = {
    base::ThreadCheckerImpl = {
      lock_ = {
        owning_thread_ref_ = {
          id_ = 0x0000000000000000
        }
        lock_ = {
          native_handle_ = (__sig = 1297437784, __opaque = char [56] @ 0x00007f8032f627f0)
        }
      }
      valid_thread_id_ = {
        id_ = 0x000070000c372000
      }
    }
  }
}