Gets aura_demo working with the view_manager

Gets aura_demo working with the view_manager

I made it talk directly to the view_manager. We'll likely want a
variant that talks to the client_lib too.

BUG=365012
TEST=covered by tests
R=ben@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=274449

[Ben Goodger (Google), 2014-06-02 21:38:49]

lgtm.

looks like there are some bits of potential shared code here. context factory.
window tree host. init launcher. food for thought.

[sky, 2014-06-02 22:05:15]

The CQ bit was checked by sky@chromium.org

[sky, 2014-06-02 22:05:39]

Totally agree on the reusable part. We can shuffle things around as we get more
working.

[commit-bot: I haz the power, 2014-06-02 22:06:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sky@chromium.org/313483002/40001

[commit-bot: I haz the power, 2014-06-03 09:16:28]

Change committed as 274449