SDK / exoplayer

We are currently defaulting to targetSdk=1 as no targetSdk is specified. Only
tests which explicitly ask for another SDK use another test SDK. With the
versioned manifest, all tests run using the targetSDK by default.

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Issue: #5735
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Issue: #5891
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We previously only checked whether the reason for the timeline change is
RESET which indicates an empty timeline. Change this to an explicit check
for empty timelines to also ignore empty media or intermittent timeline
changes to an empty timeline which are not marked as RESET.

Issue:#5831
PiperOrigin-RevId: 248499118

Split a few assertThat(a && b).isTrue() calls into separate assertions for more precise diagnostics.

Issue: #5891
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Issue: #5876
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Issue: #5862
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Issue:#5568
PiperOrigin-RevId: 247973411

Accessing task providers (like javaCompileProvider) at sync time is not
possible. That's why the source sets of all generateJavadoc tasks is empty.

The set of source directories can also be accessed directly through the static
sourceSets field. Combining these allows to statically provide the relevant
source files to the javadoc task without needing to access the run-time task
provider.

PiperOrigin-RevId: 247938176

Issue: #5876
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Issue: #5782
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The update to Gradle 5.1.1 decreased the default heap size to 512MB and our
build runs into Out-of-Memory errors.

Setting the gradle flags to higher values instead.

See https://developer.android.com/studio/releases/gradle-plugin#3-4-0

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Issue:#5821
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Issue:#5868
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In preparation for reference counting in DrmSession

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If a PlayerMessage throws an exception, it is currently not deleted from the
list of pending messages. This may be problematic as the list of pending
messages is kept when the player is retried without reset and the message is
sent again in such a case.

PiperOrigin-RevId: 247414494

PiperOrigin-RevId: 247348352

Adding an explicit option to clear all downloads prevents repeated database
access in a loop when trying to delete all downloads.

However, we still create an arbitrary number of parallel Task threads for this
and seperate callbacks for each download.

PiperOrigin-RevId: 247234181

1. A content session after an ad has been played was not re-marked as active,
   leading to new ad session being marked as active too early.
2. Switching from content to post-roll ended the content session because
   the return value of getAdGroupTimeUs of C.TIME_END_OF_SOURCE was not
   handled. Using the nextAdGroupIndex instead.

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NOTE: Streams are working on ExoPlayer but querying them from
other platforms yields "bad request".

The new links:
+ Match Microsoft's test server.
+ Allow querying from clients other than ExoPlayer, like curl.

PiperOrigin-RevId: 246289755

Post-submit fixes for https://github.com/google/ExoPlayer/commit/eed5d957d87d44cb9c716f1a4c80f39ad2a6a442.

One wrong return value, a useless assignment, unusual visibility of private
class fields and some nullability issues.

PiperOrigin-RevId: 246282995