applets/mediacontroller: use PauseAnimation to delay showing busy indicator
This is more reliable, by using the opacity animation in PC3.BusyIndicator itself. (cherry picked from commit 9a906635) CCBUG: 471248
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This is more reliable, by using the opacity animation in PC3.BusyIndicator itself. (cherry picked from commit 9a906635) CCBUG: 471248