Add blink_test_support target.

Add blink_test_support target.

This target will replace the current blink_web_test_support target. But
we need to add it first, then change Chromium to use, just after that we
will be able to remove blink_web_test_support from blink.gyp.

In fact webkit_test_support after this three side change lands,
webkit_test_support will actually be renamed to blink_web_test_support.

BUG=None
TEST=content_unittests, blink_tests
R=abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168315

[tfarina, 2014-03-03 05:18:19]

Adam, this is my plan.

PTAL.

Thanks!

[abarth-chromium, 2014-03-03 06:41:45]

lgtm

[tfarina, 2014-03-03 14:35:51]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-03-03 14:36:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tfarina@chromium.org/180743011/1

[commit-bot: I haz the power, 2014-03-03 15:52:41]

Change committed as 168315