SDK / exoplayer

The total window and period count, as well as the period offset for each holder
are not actually needed and can be removed.

Also added a TODO to remove two other variables if possible.

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Issue:#6109
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ISSUE: #6093
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The updated version issues more warnings than before.
Most of the changes are related to annotation placement.

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Also add layer of indirection between code and the guide, to
make moving content easier going forward.

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This better reflects its usage and fits into our general naming pattern.

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stack trace contains MediaCodec.

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Issue: #5928
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Reads from a SampleQueue, associating each read format with a
DrmSession, if needed.

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Builds now fail when raw generics are used.

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ISSUE: #6041
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More information (LSC)
https://docs.google.com/document/d/16tpK6aXqN68PvTyvt4siM-m7f0NXi_8xEeitLDzr8xY/edit?usp=sharing

Tested:
    tap_presubmit: http://test/OCL:253818309:BASE:253788332:1560879553629:9dc07a48
    Some tests failed; test failures are believed to be unrelated to this CL
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We are currently queuing periods in a way such that the new start position
lines up with the end of the previous period (to ensure continuous playback).
However, if the start position of the new period is larger than the total of
all previously played period durations, we may end up with negative renderer
timestamps when seeking back to the beginning of this new period. Negative
timestamps should be avoided as most decoders have problems handling them
correctly.

This change forces a renderer reset if we detect such a seek to a negative
renderer time and also resets the renderer offset to 0 every time all
renderers are disabled, as this is the only time where we can savely change
the offset of an existing media period.

Also, if playback starts with an ad, we choose the content position as
renderer offset to prevent the whole issue from occurring for the seek-behind-
midroll case.

Issue:#6009
Issue:#5323
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Issue: #6031
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Issue:#6006
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In some edge cases the renderer position may be slightly ahead of the
buffered position and the total buffered duration is thus negative. We already
filter that in ExoPlayerImpl for the publicly accessible value. However, we
forward the unfiltered value to other components like the LoadControl, which
may be confusing.

Issue:#6015
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This permission has normal access right and can't be revoked by the user.
However, an app can choose to revoke it when using ExoPlayer, e.g. if
no network is required and the app doesn't want to list this permission.

Support this use case by gracefully catching the exception in the relevant
places.

Issue:#6019
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Avoids nullable DrmSessionManagers and simplifies sample reading.
To be used as default value for MediaSources.

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Makes it throwable from SampleStream.maybeThrowError

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