mojo_runner: Use prefer_own_symbols when loading DSOs

mojo_runner: Use prefer_own_symbols when loading DSOs

Uses the new prefer_own_symbols option on LoadNativeLibrary
to ensure that loaded service libraries always prefer local
symbols over global ones.

This fixes asymmetry between tc_malloc/free inside DSO code
which has been breaking ash+skia in non-component builds.

BUG=594674

[Ken Rockot(use gerrit already), 2016-08-24 21:06:11]

The CQ bit was checked by rockot@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-24 21:07:03]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Ken Rockot(use gerrit already), 2016-08-24 21:30:28]

The CQ bit was checked by rockot@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-24 21:30:58]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-24 22:50:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-24 22:50:04]

Dry run: Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Ken Rockot(use gerrit already), 2016-08-24 23:34:26]

The CQ bit was checked by rockot@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-24 23:35:34]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-25 00:08:55]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-25 00:08:56]

Dry run: Try jobs failed on following builders:
  cast_shell_linux on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[Ken Rockot(use gerrit already), 2016-08-25 23:21:59]

The CQ bit was checked by rockot@chromium.org to run a CQ dry run

[Ken Rockot(use gerrit already), 2016-08-25 23:22:26]

rockot@chromium.org changed reviewers:
+ sky@chromium.org

[commit-bot: I haz the power, 2016-08-25 23:22:48]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Ken Rockot(use gerrit already), 2016-08-25 23:23:36]

Description was changed from

==========
mojo_runner: Use prefer_own_symbols when loading DSOs

Uses the new prefer_own_symbols option on LoadNativeLibrary
to ensure that loaded service libraries always prefer local
symbols over global ones.

BUG=594674
==========

to

==========
mojo_runner: Use prefer_own_symbols when loading DSOs

Uses the new prefer_own_symbols option on LoadNativeLibrary
to ensure that loaded service libraries always prefer local
symbols over global ones.

This fixes asymmetry between tc_malloc/free inside DSO code
which has been breaking ash+skia in non-component builds.

BUG=594674
==========

[commit-bot: I haz the power, 2016-08-26 01:02:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-26 01:02:54]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Ken Rockot(use gerrit already), 2016-08-26 02:06:12]

Surprise! This breaks a bunch of other tests now, with similar tcmalloc errors.
:|

[Ken Rockot(use gerrit already), 2016-08-26 02:07:16]

(I bet we need RTLD_GLOBAL even though I thought we wouldn't)

[sky, 2016-08-26 03:17:28]

LGTM