Define gyp targets for mojo/public/* in mojo/public/mojo_public.gyp

Define gyp targets for mojo/public/* in mojo/public/mojo_public.gyp

The targets in the mojo public SDK, i.e. those in mojo/public/, should
be free of dependencies outside of mojo/public/ and usable in a
standalone fashion. This moves the gyp definitions from
mojo/mojo_base.gyp, which also contains a number of non-public targets,
to mojo/public/mojo_public.gyp.

R=viettrungluu@chromium.org
TBR=darin@chromium.org for updating various gyp entries to point to new target location

Committed: https://crrev.com/b83f9dcb4940d4700632fe9e925abec779ad84ef
Cr-Commit-Position: refs/heads/master@{#298422}

[jamesr, 2014-10-06 22:36:15]

jamesr@chromium.org changed reviewers:
+ darin@chromium.org, viettrungluu@chromium.org

[jamesr, 2014-10-06 22:36:15]

vtl@ - please review

darin@ - please stamp for top-level OWNERS

[viettrungluu, 2014-10-06 22:49:35]

LGTM as far as I can tell (which isn't very far).

[jamesr, 2014-10-07 06:42:46]

The CQ bit was checked by jamesr@chromium.org

[commit-bot: I haz the power, 2014-10-07 06:43:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/632853002/60001

[commit-bot: I haz the power, 2014-10-07 06:48:14]

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

[commit-bot: I haz the power, 2014-10-07 06:48:15]

Try jobs failed on following builders:
  ios_rel_device on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device/bu...)

[jamesr, 2014-10-07 06:52:12]

The CQ bit was checked by jamesr@chromium.org

[commit-bot: I haz the power, 2014-10-07 06:52:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/632853002/80001

[commit-bot: I haz the power, 2014-10-07 08:04:18]

Committed patchset #5 (id:80001) as eed7fbf9371f1aa54cba75e50bf79cd581774916

[commit-bot: I haz the power, 2014-10-07 08:05:06]

Patchset 5 (id:??) landed as
https://crrev.com/b83f9dcb4940d4700632fe9e925abec779ad84ef
Cr-Commit-Position: refs/heads/master@{#298422}