Complete rewrite of isolate.py to be more modular.

Complete rewrite of isolate.py to be more modular.

Use an OO approach to store the state. Make the code clearer.

1. Remove 'variables' from foo.result and create foo.state for less important
state.

2. Store and manage the file paths in native os.path.sep. Simplify the whole
code.

3. Remove the requirement of providing a .isolate file to isolate.py when
providing an existing .result file. Make it reuse the result file's data as
needed, simplifying user's life.

R=nsylvain@chromium.org
BUG=98637
TEST=manually ran all the tests on linux and windows


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=136111

[M-A Ruel, 2012-05-09 15:00:44]

Sorry for the heavy CL.

[nsylvain, 2012-05-09 16:59:51]

Looking at the diff is not really useful, mainly that I'm not super familiar
with the previous version. Feel free to commit, and when you do i'll checkout
the new code and read through it all to see if I see stuff, and then I'll send
you an email with my comments. (implied lgtm)

[commit-bot: I haz the power, 2012-05-09 17:02:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/10387037/1

[commit-bot: I haz the power, 2012-05-09 20:18:59]

Change committed as 136111