Add a simple inksplash example

Add a simple inksplash example

We'll eventually turn this into a full fn2 component, but for now it's just an
example.

To make this work, I created a schedule.dart as a start to implementing
scheduler.md. For now, I've kept the API similar to the web platform so that
the old world can continue use it backed by sky.window.requestAnimationFrame.

R=eseidel@chromium.org
BUG=

Committed: https://chromium.googlesource.com/external/mojo/+/0cb5198b731fc2b4710d327d5899f92cdc4dca02

[eseidel, 2015-05-29 20:53:11]

lgtm

Love the new scheduler.  You had me create an fn2 examples dir, you might wnat
to move some of yours there.

[abarth-chromium, 2015-05-29 20:54:54]

On 2015/05/29 at 20:53:11, eseidel wrote:
> Love the new scheduler.  You had me create an fn2 examples dir, you might wnat
to move some of yours there.

Yeah, I agree that will make sense in the next iteration when this actually
imports fn2 and inherits from component.

[abarth-chromium, 2015-05-29 20:55:16]

Committed patchset #2 (id:20001) manually as
0cb5198b731fc2b4710d327d5899f92cdc4dca02 (presubmit successful).