Update media codec values in histograms.xml
Update media codec values in histograms.xml

Added kCodecALAC value from media::AudioCodec in
media/base/audio_decoder_config.h and HEVC value (from media::CodecInfo
in media/filters/stream_parser_factory.cc).

BUG=none

Review URL: https://codereview.chromium.org/1468683003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360986}

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