Fix test harness for Test262 to not use symlinks.

Fix test harness for Test262 to not use symlinks.

This is necessary for the --download-data option to work on Windows
where we do not have symlinks available. Note that we still have no
automatic way of bumping the existing Test262 revision without deleting
the data directory manually.

R=jkummerow@chromium.org
TEST=test262

Committed: https://code.google.com/p/v8/source/detail?r=11172

[Jakob Kummerow, 2012-03-28 08:06:10]

LGTM.

Here's an idea for automatic updating:
- When creating a 'data' directory, store the extracted test revision in a file
(the Python equivalent of: echo "$revision" > REVISION_FILE)
- before the check "if not exists(directory_name):", insert the following
pseudocode: "if (content('REVISION_FILE') != $revision) { delete
$directory_name; }"

Of course, it's fine to add that in another CL.

https://chromiumcodereview.appspot.com/9866046/diff/1/test/test262/testcfg.py
File test/test262/testcfg.py (right):

https://chromiumcodereview.appspot.com/9866046/diff/1/test/test262/testcfg.py...
test/test262/testcfg.py:1: # Copyright 2011 the V8 project authors. All rights
reserved.
2012

[Michael Starzinger, 2012-03-28 09:29:29]

Yes, keeping the extracted revision in some kind of stamp file would certainly
do it. But then again, deleting the old "data" directory is the pain point on
Windows. So I am actually thinking about letting "gclient" do that for us every
time, because it has all the tricks to actually delete untracked directories in
SVN checkouts on all platforms. Then our test harness would just extract the
downloaded archive on every cycle, which takes about one minute. It wouldn't
repeat the download itself, because untracked files are left untouched by
"gclient".

Will do that in a separate CL once we bump Test262 to a new version for the
first time (do it lazily according to the spirit of V8).

https://chromiumcodereview.appspot.com/9866046/diff/1/test/test262/testcfg.py
File test/test262/testcfg.py (right):

https://chromiumcodereview.appspot.com/9866046/diff/1/test/test262/testcfg.py...
test/test262/testcfg.py:1: # Copyright 2011 the V8 project authors. All rights
reserved.
On 2012/03/28 08:06:10, Jakob wrote:
> 2012

Done.