SDK / exoplayer

If the sample type is Dolby Vision and the display does not support Dolby Vision, then the capabilities DecoderSupport flag is set to DECODER_SUPPORT_FALLBACK_MIMETYPE. This denotes that the renderer will use a decoder for a fallback mimetype if possible. This alters track selection as tracks with DecoderSupport DECODER_SUPPORT_PRIMARY are preferred.

UnitTests included
-DefaultTrackSelector test that checks track selection reordering with DECODER_SUPPORT_FALLBACK_MIMETYPE
-MediaCodecVideoRenderer test that checks setting of DecoderSupport flag based on Display's Dolby Vision support

Issue: google/ExoPlayer#8944
PiperOrigin-RevId: 480040876
(cherry picked from commit 266de1b2)