Many video codecs use a suffix to specify level, profile and optional features,
like "avc1.42E001" or "vp09.00.41.08".
MediaCodecs::ContainsPrefix() can be used to facilitate codec identification
from their prefix alone, e.g.: "avc1" or "vp09".
MozReview-Commit-ID: D6kcjggXptS
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extra : rebase_source : 3a60c01da1d91adf29f51ce3c32f8df60282c90a