SDK / exoplayer

When playing a playlist where the exact maximum input size is known from the
container for each item, it may be necessary to recreate the decoder to increase
its maximum input buffer size at the point of transitioning from one item to the
next, which can make transitions non-seamless.

Scale up the initial video decoder maximum input size so playlist item
transitions with small increases in maximum sample size don't require
reinitialization.

Issue: #4510

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=208650244