Make some chrome feature flags customizable in GN build

Make some chrome feature flags customizable in GN build

These flags are customizable in GYP build.

BUG=

Committed: https://crrev.com/233bbd6b46f28867f040078923f9809937736340
Cr-Commit-Position: refs/heads/master@{#382854}

[Tomasz Moniuszko, 2016-03-23 11:21:19]

tmoniuszko@opera.com changed reviewers:
+ sky@chromium.org

[sky, 2016-03-23 15:28:20]

LGTM

[Tomasz Moniuszko, 2016-03-23 15:39:30]

The CQ bit was checked by tmoniuszko@opera.com

[commit-bot: I haz the power, 2016-03-23 15:39:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1830543002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1830543002/1

[commit-bot: I haz the power, 2016-03-23 16:11:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-23 16:12:06]

Description was changed from

==========
Make some chrome feature flags customizable in GN build

These flags are customizable in GYP build.

BUG=
==========

to

==========
Make some chrome feature flags customizable in GN build

These flags are customizable in GYP build.

BUG=

Committed: https://crrev.com/233bbd6b46f28867f040078923f9809937736340
Cr-Commit-Position: refs/heads/master@{#382854}
==========

[commit-bot: I haz the power, 2016-03-23 16:12:08]

Patchset 1 (id:??) landed as
https://crrev.com/233bbd6b46f28867f040078923f9809937736340
Cr-Commit-Position: refs/heads/master@{#382854}