Factor out position tracking from DefaultAudioSink

DefaultAudioSink had a lot of code related to tracking the position of the underlying AudioTrack, and working around issues with the position APIs. Move this code to a separate class responsible for position tracking. This is in preparation for improving the audio timestamp polling behavior. This change is intended not to cause any behavior changes. Issue: #3841 ------------- Created by MOE: https:/google/moe MOE_MIGRATED_REVID=189344743
google · Mar 27, 2018 · 245c59c · 245c59c
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diff --git a/RELEASENOTES.md b/RELEASENOTES.md
@@ -21,6 +21,7 @@
  deprecated `DynamicConcatenatingMediaSource`.
  * Allow clipping of child media sources where the period and window have a
  non-zero offset with `ClippingMediaSource`.
+* Audio: Factor out `AudioTrack` position tracking from `DefaultAudioSink`.
 
 ### 2.7.1 ###