Move Android version stamping from an exec_script -> build rule

Move Android version stamping from an exec_script -> build rule

BUG=

Committed: https://crrev.com/5f3dec8ead48312eea0b4a27329c4faf231333c7
Cr-Commit-Position: refs/heads/master@{#338292}

[agrieve, 2015-07-09 19:37:37]

agrieve@chromium.org changed reviewers:
+ cjhopman@chromium.org, yfriedman@chromium.org

[agrieve, 2015-07-09 19:37:37]

yfriedman@chromium.org: Please review changes in 

cjhopman@chromium.org: Please review changes in

[cjhopman, 2015-07-10 02:30:18]

lgtm

[Yaron, 2015-07-10 12:17:48]

lgtm

[agrieve, 2015-07-10 13:58:11]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2015-07-10 13:58:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1229073003/1

[commit-bot: I haz the power, 2015-07-10 14:10:59]

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

[commit-bot: I haz the power, 2015-07-10 14:11:00]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[agrieve, 2015-07-10 14:29:10]

The CQ bit was checked by agrieve@chromium.org

[agrieve, 2015-07-10 14:29:10]

The patchset sent to the CQ was uploaded after l-g-t-m from
cjhopman@chromium.org, yfriedman@chromium.org
Link to the patchset: https://codereview.chromium.org/1229073003/#ps20001
(title: "fix default argument for native lib version")

[commit-bot: I haz the power, 2015-07-10 14:29:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1229073003/20001

[commit-bot: I haz the power, 2015-07-10 15:18:49]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-10 15:19:35]

Patchset 2 (id:??) landed as
https://crrev.com/5f3dec8ead48312eea0b4a27329c4faf231333c7
Cr-Commit-Position: refs/heads/master@{#338292}