Define copy rule for content_shell.pak required for running webkit_unit_tests on android.

Define copy rule for content_shell.pak required for running webkit_unit_tests on android.

This is required for CL, https://codereview.chromium.org/456413002, to run webkit_unit_tests on android.
In subsequenct CL from blink side, https://codereview.chromium.org/542003002, we should extend the android.py to start sending this file to the
device under test.

R=jochen@chromium.org
NOTRY=true

Committed: https://crrev.com/e136a86565fcf76940b8df7c51e2c41fa85a71d1
Cr-Commit-Position: refs/heads/master@{#293500}

[vivekg, 2014-09-05 03:01:03]

vivekg@chromium.org changed reviewers:
+ vivekg@chromium.org

[vivekg, 2014-09-05 03:01:04]

PTAL, thank you!

[jochen (gone - plz use gerrit), 2014-09-05 08:27:52]

lgtm

[vivekg, 2014-09-05 08:43:43]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-09-05 08:44:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/544903003/1

[vivekg, 2014-09-05 10:50:52]

The CQ bit was unchecked by vivekg@chromium.org

[vivekg, 2014-09-05 10:50:54]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-09-05 10:50:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/544903003/1

[commit-bot: I haz the power, 2014-09-05 10:52:26]

Committed patchset #1 (id:1) as 09c25825997fc7a4355a6cb156035f385f0b1d3e

[commit-bot: I haz the power, 2014-09-10 03:38:49]

Patchset 1 (id:??) landed as
https://crrev.com/e136a86565fcf76940b8df7c51e2c41fa85a71d1
Cr-Commit-Position: refs/heads/master@{#293500}