Fix AnimationUtils getExpectedPresentationTimeNanos

Fix AnimationUtils.getExpectedPresentationTimeNanos(). If the flag is
not enabled, it should return the time in nanoseconds instead of
milliseconds.

Bug: 322358548
Test: atest AnimationUtilsTest
Change-Id: I13b8a96ff7467559284fbbea0b21ca7babc58550
1 file changed