Additional fix for rounding overlay display_rect to integers

Additional fix for rounding overlay display_rect to integers

This change: https://codereview.chromium.org/1110813002/ was missing a
key step - after an ozone platform validator has rounded display_rect
to integer coordinates, that data needs passing back through to the
compositor overlay candidate data - otherwise the assert is still fired.

BUG=

Committed: https://crrev.com/54790f7bb0d37dd057344a01c2934f01b5043b06
Cr-Commit-Position: refs/heads/master@{#329210}

[halliwell, 2015-05-09 00:39:14]

halliwell@chromium.org changed reviewers:
+ alexst@chromium.org, danakj@chromium.org

[danakj, 2015-05-09 01:30:06]

lgtm

[halliwell, 2015-05-11 17:48:56]

The CQ bit was checked by halliwell@chromium.org

[commit-bot: I haz the power, 2015-05-11 17:55:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133953002/1

[commit-bot: I haz the power, 2015-05-11 18:48:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-11 18:50:44]

Patchset 1 (id:??) landed as
https://crrev.com/54790f7bb0d37dd057344a01c2934f01b5043b06
Cr-Commit-Position: refs/heads/master@{#329210}