Extract files for implementing unit tests from ash_unittests.

Extract files for implementing unit tests from ash_unittests.

This change is needed for adding tests in http://codereview.chromium.org/11033038/.

BUG=154183
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=160573

[sky, 2012-10-05 21:35:42]

LGTM

[commit-bot: I haz the power, 2012-10-05 21:41:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mazda@chromium.org/11066045/1

[commit-bot: I haz the power, 2012-10-05 22:48:33]

Retried try job too often for step(s) interactive_ui_tests

[commit-bot: I haz the power, 2012-10-05 22:57:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mazda@chromium.org/11066045/1

[commit-bot: I haz the power, 2012-10-05 23:07:13]

Step "update" is always a major failure.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-10-06 00:28:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mazda@chromium.org/11066045/18002

[commit-bot: I haz the power, 2012-10-06 02:24:29]

Sorry for I got bad news for ya.
Compile failed with a clobber build.
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-10-06 04:00:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mazda@chromium.org/11066045/18002

[commit-bot: I haz the power, 2012-10-06 07:51:13]

Change committed as 160573