Fix the "--enable-viewport" command line option

Fix the "--enable-viewport" command line option

Enable "CSSViewport" runtime feature if the "--enable-viewport"
command line option is present.

BUG=420535
Committed: https://crrev.com/1bee12df710f45a4e4fac93dfa66b481eb1f39df
Cr-Commit-Position: refs/heads/master@{#299475}

[Mikhail, 2014-10-13 10:10:20]

mikhail.pozdnyakov@intel.com changed reviewers:
+ jochen@chromium.org

[Mikhail, 2014-10-13 10:10:35]

PTAL

[Mikhail, 2014-10-14 09:55:13]

On 2014/10/13 10:10:35, Mikhail wrote:
> PTAL

Any update here, please?

[jochen (gone - plz use gerrit), 2014-10-14 13:58:01]

lgtm

[Mikhail, 2014-10-14 14:01:30]

The CQ bit was checked by mikhail.pozdnyakov@intel.com

[commit-bot: I haz the power, 2014-10-14 14:02:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/633943002/1

[commit-bot: I haz the power, 2014-10-14 14:15:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-14 14:16:26]

Patchset 1 (id:??) landed as
https://crrev.com/1bee12df710f45a4e4fac93dfa66b481eb1f39df
Cr-Commit-Position: refs/heads/master@{#299475}