- There is a proper ClearKey UUID now. This change requires
it to be used instead of the Common PSSH UUID when instantiating
DRM components.
- Internally, we'll map the ClearKey UUID onto the Common PSSH
UUID where necessary to (a) access the ClearKey CDM on older
devices, and (b) access drm init data stored under the Common
PSSH UUID in the stream.
Issue: #3138
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Created by MOE: https://github.com/google/moe
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