Give more time to the dart2js transformer tests.

Give more time to the dart2js transformer tests.

BUG=https://code.google.com/p/dart/issues/detail?id=13871
R=nweiz@google.com

Committed: https://code.google.com/p/dart/source/detail?r=28327

[nweiz, 2013-10-07 21:29:13]

lgtm

Would it be cleaner to wrap [integration] in a utils file in
test/transformer/dart2js?

[Bob Nystrom, 2013-10-07 21:38:03]

On 2013/10/07 21:29:13, nweiz wrote:
> lgtm
> 
> Would it be cleaner to wrap [integration] in a utils file in
> test/transformer/dart2js?

I'd rather not wrap integration() because then it's less obvious what's going
on. I thought about making a little helper function for this, but I figured it
was a small enough chunk of code to not be worth the bother.

[Bob Nystrom, 2013-10-07 21:38:52]

Committed patchset #1 manually as r28327 (presubmit successful).