SDK / exoplayer

When reading the last period, the readingPeriodHolder was set to null in
updatePeriods if it was the last period. (This would occur almost immediately
when playing a single-period source.) seekToPeriodPosition suppresses reusing a
loaded/prepared period if the reading period and playing period did not match,
which meant that the whole timeline was recreated when seeking in the last
period.

Leave readingPeriodHolder non-null. This means that at all times either
playingPeriodHolder == readingPeriodHolder (and they could be null or
non-null), or playingPeriodHolder and readingPeriodHolder differ and are both
non-null.

Also fix an issue where streams were never forced to be recreated during track
reselection when reading ahead.

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All of the classes in the text.eia608 package have been moved to
text.cea, and renamed with the "cea" prefix instead of "eia". All of
the buffering logic has been extracted from Cea608Decoder (formerly
Eia608Decoder) into the abstract CeaDecoder, which Cea608Decoder
extends. Cea608Decoder also now expects a 3-byte sample (i.e. the
entire cc_data_pkt instead of just the cc_data_1 and cc_data_2 bytes).
Classes like RawCcExtractor and SeiReader, responsible for creating
these samples, have also been updated accordingly.

This change is a necessary precursor to adding support for multi
-channel CEA-608 and CEA-708 captions.

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This encourages a single invalidation when setting different parameters.

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Created by MOE: https://github.com/google/moe
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Issue:#726

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Issue: #1853

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Created by MOE: https://github.com/google/moe
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HlsSampleStreamWrapper and ExtractorMediaPeriod would call
onPrepared/onSourceInfoRefreshed from their loading threads. That was
problematic for ConcatenatingMediaSource and MergingMediaSource, which assume
that their callbacks are called on the same thread (iterating through timelines
from all sources and updating pendingTimelineSources respectively). This change
makes them post calls to the callbacks on the playback thread.

Generally, implementing a composite MediaSource is easier if
MediaPeriod.Callback's methods are all called on the same (playback) thread, so
this change makes that part of its contract.

Also post onContinueLoadingRequested from ExtractingLoadable because
MergingMediaPeriod.onContinueLoadingRequested reads trackGroups written on the
playback thread.

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As described in https://github.com/google/spatial-media/blob/master/docs/spherical-video-v2-rfc.md.
Also parse StereoMode as per standard matroska spec.

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Eia608Decoder.

Full preamble positioning will be provided in a subsequent CL. This CL
also contains some minor cleanup in Eia608Decoder and adds some TODOs
to handle the second channel.

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This solves the thread unsafety issue of the default track selector and
allows atomic configuration changes.

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Issue:#1772

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Issue: #1850

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Issue #1837

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*** Reason for rollback ***

2.14.1 not compatible with 2.1.2. Oops.

*** Original change description ***

Upgrade gradle to 2.14.1

***

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Issue: #1825

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Issue #1823

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Also add a test MP3 stream with one frame.

Make FakeExtractorInput's end of input detection to apply also for peekFully, and
make its skip and read methods read at least one byte.

Issue: #1732

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The four-arg constructor didn't exist in ViewGroup for
earlier API levels. I think it can probably be safely
omitted, unless you know otherwise?

Issue: #1820

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It defaults to 5000, which allows frames to be dropped in an
attempt to seamlessly rejoin when re-enabling video during an
ongoing playback. This causes performance failures when running
the test*AdaptiveWithRendererDisabling playback tests.

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