SDK / exoplayer

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201695876

Issue:#3393

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201694813

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201679215

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201678686

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201678261

Allows DrmInitData to carry a license server URL when the media declares one.

Issue:#3393

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199643743

r2.8.2

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201530049

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=200211755

This allows injection of custom implementations and configuration of
DefaultHlsPlaylistTracker without modifying the HlsMediaSource interface.

Issue:#2844

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198846607

Issue:#4394

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201178909

Issue: #4403

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201525284

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201376315

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201374393

Issue: #4396

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201324467

This avoids a small native leak.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=200955086

Issue: #3906

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=200526335

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199856613

Also add a few missing MP4 object types.

Issue: #4264

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199778373

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199758072

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199683216

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199650794

When switching from Stack to ArrayDeque, calls to add() need to be replaced by
calls to push() because ArrayDeque treats the first element in the list as the
top of the stack.

String.split() has counterintuitive default behavior; see
https://github.com/google/error-prone/blob/master/docs/bugpattern/StringSplitter.md.
I've switched usages to pass limit = -1 argument, which means empty elements are
no longer removed from the end of the returned array.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199472592

Issue: #4292

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199478946

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199453125

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199448766

Issue: #4315

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199266768

If a MediaPeriod uses a Loadable, then there are typically
reference chains of the form:

LoadingThread[GCroot]->Loadable->MediaPeriod->Player

Where the player is the MediaPeriod callback. When the
player is released, this reference chain prevents the
player from being GC'd until Loadable cancellation
completes, which may not always be fast. This in turn
will typically prevent the application's activity from
being GC'd, since it'll normally be registered as a
listener on the player (directly or indirectly via
something like a view).

This change mitigates the issue by removing references
that the MediaPeriod holds back to the player. The
MediaPeriod will still not be eligible for GC, but the
player and application activity will be, which in most
cases will be most of the leak (in terms of size).

Issue: #4249

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199143646

This happens when the device screen is locked.

This fixes a previous attempt to fix the problem.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199130325

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199120421

This helps to use the AnalyticsCollector without SimpleExoPlayer. Currently,
that may be problematic, if the contructor needs the player, but in order to
create the player, one already needs the AnalyticsCollector as a listener for
the renderers.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199105012

This happens when the device screen is locked.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198875192

This simplifies Loadable implementations, and also removes the
possibility of an incorrect Loadable implementation causing the
wrong Loader.Callback method being called (perviously, for the
correct method to be called, we relied on isLoadCanceled being
implemented correctly).

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198871133

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198860680