fix(HLS): Fix timeline sync gaps on discontinuity sequences

[avelad]

Calculates and compensates for PDT drift only when the discontinuity sequence changes, preventing timeline breaks during manifest updates.

Fixes #10084

[shaka-bot]

Bundle Size Report for PR #10087

File	HEAD	Base	Diff
controls.css	24.0 KiB (5.0 KiB)	24.0 KiB (5.0 KiB)	0.0 KiB
demo.compiled.debug.js	258.3 KiB (51.8 KiB)	258.3 KiB (51.8 KiB)	0.0 KiB
demo.compiled.js	258.3 KiB (51.8 KiB)	258.3 KiB (51.8 KiB)	0.0 KiB
demo.css	170.4 KiB (27.8 KiB)	170.4 KiB (27.8 KiB)	0.0 KiB
locales.js	43.6 KiB (10.8 KiB)	43.6 KiB (10.8 KiB)	0.0 KiB
receiver.compiled.debug.js	148.8 KiB (24.1 KiB)	148.8 KiB (24.1 KiB)	0.0 KiB
receiver.compiled.js	148.8 KiB (24.1 KiB)	148.8 KiB (24.1 KiB)	0.0 KiB
shaka-player.compiled-es2021.debug.js	1257.6 KiB (309.0 KiB)	1257.4 KiB (309.0 KiB)	+0.2 KiB
shaka-player.compiled-es2021.js	665.7 KiB (221.8 KiB)	665.6 KiB (221.8 KiB)	+0.1 KiB
shaka-player.compiled.debug.js	1529.5 KiB (350.2 KiB)	1529.3 KiB (350.1 KiB)	+0.2 KiB
shaka-player.compiled.js	769.8 KiB (249.5 KiB)	769.7 KiB (249.5 KiB)	+0.1 KiB
shaka-player.dash-es2021.debug.js	925.6 KiB (232.4 KiB)	925.6 KiB (232.4 KiB)	0.0 KiB
shaka-player.dash-es2021.js	459.4 KiB (156.7 KiB)	459.4 KiB (156.7 KiB)	0.0 KiB
shaka-player.dash.debug.js	1123.3 KiB (262.4 KiB)	1123.3 KiB (262.4 KiB)	+0.0 KiB
shaka-player.dash.js	533.5 KiB (176.7 KiB)	533.5 KiB (176.7 KiB)	0.0 KiB
shaka-player.experimental-es2021.debug.js	1648.3 KiB (393.6 KiB)	1648.1 KiB (393.6 KiB)	+0.2 KiB
shaka-player.experimental-es2021.js	918.8 KiB (291.1 KiB)	918.7 KiB (291.0 KiB)	+0.1 KiB
shaka-player.experimental.debug.js	1984.4 KiB (443.7 KiB)	1984.2 KiB (443.6 KiB)	+0.2 KiB
shaka-player.experimental.js	1044.8 KiB (324.5 KiB)	1044.7 KiB (324.5 KiB)	+0.1 KiB
shaka-player.hls-es2021.debug.js	955.2 KiB (237.6 KiB)	955.0 KiB (237.6 KiB)	+0.2 KiB
shaka-player.hls-es2021.js	492.2 KiB (166.6 KiB)	492.1 KiB (166.6 KiB)	+0.1 KiB
shaka-player.hls.debug.js	1158.1 KiB (268.5 KiB)	1157.9 KiB (268.4 KiB)	+0.2 KiB
shaka-player.hls.js	569.3 KiB (187.6 KiB)	569.2 KiB (187.5 KiB)	+0.1 KiB
shaka-player.ui-es2021.debug.js	1565.9 KiB (376.2 KiB)	1565.7 KiB (376.1 KiB)	+0.2 KiB
shaka-player.ui-es2021.js	878.4 KiB (279.5 KiB)	878.3 KiB (279.4 KiB)	+0.1 KiB
shaka-player.ui.debug.js	1872.0 KiB (422.5 KiB)	1871.8 KiB (422.4 KiB)	+0.2 KiB
shaka-player.ui.js	992.9 KiB (310.3 KiB)	992.8 KiB (310.2 KiB)	+0.1 KiB

[shaka-bot]

Incremental code coverage: 100.00%