Add support for running comparison of dart2js and dart2js with --dump-info output to the bots.

Add support for running comparison of dart2js and dart2js with --dump-info output to the bots.

This will compile with and without the flag, and compare the compiled output files (ignoring the json files).

If you patch this in you can run this locally by doing:

BUILDBOT_BUILDERNAME=dart2js-dump-info client/tools/buildbot_annotated_steps.py
or
BUILDBOT_BUILDERNAME=dart2js-dump-info python tools/bots/dart2js_dump_info.py
R=whesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=39546

[ricow1, 2014-08-26 09:42:36]

ricow@google.com changed reviewers:
+ sra@google.com, tyoverby@google.com

[ricow1, 2014-08-26 09:42:36]

I think it makes sense to iterate on this like this and potentially merge this
into the normal testing framework when we have it fleshed out (to allow people
to more easily reproduce locally)

[ricow1, 2014-08-26 10:33:40]

ricow@google.com changed reviewers:
+ whesse@google.com

[Bill Hesse, 2014-08-26 10:43:43]

lgtm

[ricow1, 2014-08-26 11:06:03]

Committed patchset #1 manually as r39546 (presubmit successful).