Change HarfBuzz selectionRect rounding to match simple text version

Change HarfBuzz selectionRect rounding to match simple text version

Change the HarfBuzzShaper::selectionRect rounding logic to match that of
selectionRectForSimpleText. This ensures consistent rounding for
selection rects and avoids selection gaps due to inconsistent rounding.

BUG=366705
R=dglazkov@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=172546

[dglazkov, 2014-04-24 17:00:00]

lgtm

[eae, 2014-04-24 17:01:04]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-04-24 17:01:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/250593004/1

[eae, 2014-04-24 17:03:58]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-04-24 17:04:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/250593004/20001

[commit-bot: I haz the power, 2014-04-24 17:24:50]

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

[commit-bot: I haz the power, 2014-04-24 17:24:51]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[eae, 2014-04-24 19:40:50]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-04-24 19:41:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/250593004/20001

[commit-bot: I haz the power, 2014-04-24 23:06:11]

Change committed as 172546