TransitionOptions conversion when set

[tobrun]

When looking into adding transition properties for layer attributes in #8015. I noticed that the style wide configuration of TransitionOptions in #7711 is not returning the same values as the value set. Eg. following test is failing:

long transitionDuration = 1;
mapboxMap.setTransitionDuration(transitionDuration);
assertEquals("TransitionDuration should match", transitionDuration, mapboxMap.getTransitionDuration(), 0);

with

AssertionFailedWithCauseError: TransitionDuration should match expected:<1.0> but was:<1.0E9>

Looking at the style specification, it seems that the unit should be in milliseconds while it nows seems to be set in seconds and returned in nano seconds.

[1ec5]

it seems that the unit should be in milliseconds while it nows seems to be set in seconds and returned in nano seconds.

The intention was to match the expected time unit on the platform, regardless of the style specification’s units. On iOS and macOS, the expected unit would be seconds. It looks like the Android implementation suffered from a similar issue as #8264, which was subsequently fixed on iOS and macOS by correctly round-tripping seconds values.

/cc @incanus