Add xvfb dep since we use it in run_tests.sh

Add xvfb dep since we use it in run_tests.sh

- and minor cleanup to script

BUG=
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=143749

[nilesh, 2012-06-22 20:54:39]

On 2012/06/22 20:49:42, Isaac wrote:

LGTM

[commit-bot: I haz the power, 2012-06-22 23:05:04]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Isaac (away), 2012-06-22 23:05:42]

Can haz CQ approval

[Yaron, 2012-06-22 23:07:46]

lgtm

[commit-bot: I haz the power, 2012-06-22 23:08:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ilevy@chromium.org/10660003/1

[commit-bot: I haz the power, 2012-06-22 23:58:59]

Change committed as 143749

[John Grabowski, 2012-06-26 06:58:04]

We only use xvfb if using the emulator, which we don't do.  But this is fine.

[Isaac (away), 2012-06-26 07:21:00]

We are calling run_tests.sh with '--xfvb', so the tests currently fail on
systems without this dep.  If we remove that flag we can remove these deps too.