Improve trace_inputs.py to output a format easy to convert to gypi.

Improve trace_inputs.py to output a format easy to convert to gypi.
Update scripts to have better error messages.
Improve isolate.py output directory defaults.

R=rogerta@chromium.org
BUG=98834
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=127605

[Roger Tawa OOO till Jul 10th, 2012-03-19 15:43:32]

lgtm

[commit-bot: I haz the power, 2012-03-19 17:00:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/9704099/3001

[commit-bot: I haz the power, 2012-03-19 19:46:28]

Try job failure for 9704099-3001 (retry) on win_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2012-03-19 19:48:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/9704099/3001

[commit-bot: I haz the power, 2012-03-19 22:24:16]

Try job failure for 9704099-3001 (retry) on win_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2012-03-19 23:29:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/9704099/3001

[commit-bot: I haz the power, 2012-03-20 01:17:27]

Change committed as 127605