andrewlewis 8208a75f0a Improve multi-window playback controls behavior.
Only enable multi-window mode when the duration of every period in the timeline
is known. Also, remove the warning logged when there are too many windows as it
doesn't add much.

The player's current period index was not masked while there were
unacknowledged seeks. This led to the displayed position jumping, between when
seekTo was called (after which the position would be masked but not the period
index) and the seek being acknowledged (at which point the time bar's position
would jump back to the seek position, due to the period index being resolved).
Mask the period index, like the window index, to fix this behavior.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=152116040
2017-04-06 18:53:10 +01:00
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