Follow Firefox & Chrome GIF behavior

If a GIF animation has a duration <= 10ms then bump it to
100ms. This isn't correct behavior, but it's one that browsers
have been doing for so long that gifs are now authored to rely
on this behavior

Fixes: 192511662
Test: app in bug
Change-Id: Ia07f12aa15595193ed9e56910929dc6da9754128