This CL uses the aura fling curve to ease flings. Also, I've made Event#timeStamp
use consistent units and timebase with the requestAnimationFrame timestamp. Now
both are doubles of milliseconds since the epoch.
R=esprehn@chromium.org
Review URL: https://codereview.chromium.org/880473003
This was the last complicated piece of removing
platform/heap, the rest should be trivial to delete
after removing :trace overrides and mass-renaming
the various WillBe types to their old versions.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/683593002
