Add unit_tests_run that (mostly) works for all of linux, OSX and Windows.

Add unit_tests_run that (mostly) works for all of linux, OSX and Windows.

Revert r134508 "Revert 134507, broke the main builders:"
This reapplies r134507.

The dependencies were retrieved with trace_inputs.py and merged with merge_isolate.py.

Manual edits:
- Added <(EXECUTABLE_SUFFIX) to two executables: unit_tests and xdisplaycheck.
- Removed testserver.log and unit_tests.log.
- Added copyright.
- Removed *.db-journal files.

R=rogerta@chromium.org
BUG=98636
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=134604

[M-A Ruel, 2012-04-30 16:39:10]

Dependent on https://chromiumcodereview.appspot.com/10261010 so the default is
temporarily switched to tests_run=noop until
https://chromiumcodereview.appspot.com/10264010 and
https://chromiumcodereview.appspot.com/10263009 are checked in.

[Roger Tawa OOO till Jul 10th, 2012-04-30 17:30:04]

lgtm

How often do you expect the .isolate file to be updated?  I ask because of the
manual steps needed to make it work.  Can those be added to the script that
generates the file?

[M-A Ruel, 2012-04-30 17:37:10]

On 2012/04/30 17:30:04, Roger Tawa wrote:
> lgtm
> 
> How often do you expect the .isolate file to be updated?  I ask because of the
> manual steps needed to make it work.  Can those be added to the script that
> generates the file?

Updating the list of dependencies currently look like:
- Strip out all the variables except for 'commands'
- Run on each OS:
  "python tools/isolate/isolate.py --mode trace -r
build/Release/unit_tests.results chrome/unit_tests.isolate"
- Collect the 3 outputs and call:
  "python tools/isolate/merge_isolate.py linux.isolate mac.isolate win.isolate
chrome/unit_tests.isolate > chrome/unit_tests.isolate"
- Clean up the resulting chrome/unit_tests.isolate.

Hopefully, this will become mostly automated. There are still some hand editing
I need to do in the traced file and the tests currently fails on my workstation,
both will need to be taken care of before this can be automated further. Also
root access is needed on both OSX and Windows. So overall, this should be
possible to automate on swarm eventually, that's the goal. Obviously, this
requires each of the slave to do a proper checkout.

For the devs adding a new test and new test data, it's simply a mater of
hand-editing the file.

[commit-bot: I haz the power, 2012-04-30 20:16:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/10271012/1

[commit-bot: I haz the power, 2012-04-30 21:47:01]

Change committed as 134604