Files.app: Add JobEventRouter class that handles Job related events of Files.app.

Files.app: Add JobEventRouter class that handles Job related events of Files.app.

The following CL replaces the existing code with the new class.

BUG=469039
TEST=JobEventRouterTest

Committed: https://crrev.com/0de936155933f21f1b8c2a8c9842f0f9c2263041
Cr-Commit-Position: refs/heads/master@{#321532}

[hirono, 2015-03-20 04:39:48]

hirono@chromium.org changed reviewers:
+ fukino@chromium.org

[hirono, 2015-03-20 04:39:49]

@fukino PTAL, thanks!

[fukino, 2015-03-20 06:39:23]

lgtm. Thank you!

[hirono, 2015-03-20 06:40:54]

The CQ bit was checked by hirono@chromium.org

[hirono, 2015-03-20 06:40:59]

On 2015/03/20 06:39:23, fukino wrote:
> lgtm. Thank you!

Thanks!

[commit-bot: I haz the power, 2015-03-20 06:41:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1023923002/1

[commit-bot: I haz the power, 2015-03-20 07:59:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-20 08:00:18]

Patchset 1 (id:??) landed as
https://crrev.com/0de936155933f21f1b8c2a8c9842f0f9c2263041
Cr-Commit-Position: refs/heads/master@{#321532}