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'presentationTimestamp' is being renamed to 'mediaTime', which
differentiates it from 'presentationTime'

'expectedPresentationTime' is renamed to 'expectedDisplayTime' to make
the expected usage of the field more intuitive for web developers.

'elapsedProcessingTime' is renamed to 'processingDuration', since it is
a time delta, and not a timestamp.

'presentedFrames' and 'mediaTime' are also marked as required.

Bug: 1012063
Change-Id: Iaee640e9a41eb94155096ac49057cc5e14476ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099240
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755161}