[Android] Benchmark: Add speed decoding test

[Duncan McNamara]

vlc-android | branch: master | Duncan McNamara <dcn.mcnamara at gmail.com> | Wed Jun 10 16:20:13 2020 +0200| [e936f615a967108dd61968cf7e3fa17d803cb158] | committer: Duncan McNamara

Benchmark: Add speed decoding test

This adds a new type of test to the benchmark, like playback, or quality
previously. This test will play a sample and depending on the devices'
ability to play the sample, will slow down, or speed up playback, and
after a few iterations, will converge on a maximum playback speed.

> https://code.videolan.org/videolan/vlc-android/commit/e936f615a967108dd61968cf7e3fa17d803cb158
---

 .../vlc/gui/video/benchmark/BenchActivity.kt       | 133 +++++++++++++++++++--
 .../src/org/videolan/vlc/media/PlayerController.kt |  11 ++
 .../src/org/videolan/vlc/media/PlaylistManager.kt  |   1 +
 3 files changed, 138 insertions(+), 7 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/e936f615a967108dd61968cf7e3fa17d803cb158