Set LLVM_SYMBOLIZER_PATH in test_env.py.

Set LLVM_SYMBOLIZER_PATH in test_env.py.

Hopefully it would fix mysterious crashes of browser_tests under ASAN
on Swarming mac. runtest.py (that is NOT used by Swarming) does set
LLVM_SYMBOLIZER_PATH already. Looks like this bit of logic wasn't copy-pasted
into test_env.py.

BUG=424280
R=earthdok@chromium.org,glider@chromium.org

Committed: https://crrev.com/5cf3c44e326fc9510ab117730f23fed380b6eec8
Cr-Commit-Position: refs/heads/master@{#300244}

[Vadim Sh., 2014-10-20 07:22:47]

PTAL

For the reference, here's where it is set in runtest.py:
https://code.google.com/p/chromium/codesearch#chromium/tools/build/scripts/sl...

llvm-symbolizer binary is added to the isolated package via base.isolate:
https://code.google.com/p/chromium/codesearch#chromium/src/base/base.isolate&...
(I've verified swarming bots have it).

[earthdok, 2014-10-20 09:52:37]

On 2014/10/20 07:22:47, Vadim Sh. wrote:
> PTAL
> 
> For the reference, here's where it is set in runtest.py:
>
https://code.google.com/p/chromium/codesearch#chromium/tools/build/scripts/sl...
> 
> llvm-symbolizer binary is added to the isolated package via base.isolate:
>
https://code.google.com/p/chromium/codesearch#chromium/src/base/base.isolate&...
> (I've verified swarming bots have it).

lgtm, thanks. My bad for missing this bit in
https://codereview.chromium.org/659543003/

[Vadim Sh., 2014-10-20 09:53:34]

The CQ bit was checked by vadimsh@chromium.org

[commit-bot: I haz the power, 2014-10-20 09:53:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/665873002/1

[commit-bot: I haz the power, 2014-10-20 10:22:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-20 10:23:28]

Patchset 1 (id:??) landed as
https://crrev.com/5cf3c44e326fc9510ab117730f23fed380b6eec8
Cr-Commit-Position: refs/heads/master@{#300244}

[Alexander Potapenko, 2014-10-20 15:22:25]

Doesn't asan_symbolize.py set LLVM_SYMBOLIZER_PATH already?