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shaka-player/lib/polyfill
Dave Nicholas 884c4ca4f8 feat: Caching and other efficiency improvements for mcap polyfill (#4708)
This PR caches the result of `requestMediaKeySystemAccess` saving time
on subsequent calls.

It also makes the calls to `decodingInfo` synchronous. The reason for
this, is the result of testing on multiple devices that the behaviour of
`requestMediaKeySystemAccess` appears to be synchronous, making this
synchronous can save over a second on older TVs.

Closes #4574
2022-11-18 09:34:33 -08:00
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