Move gn build file for sfntly from secondary tree into the main tree.

Move gn build file for sfntly from secondary tree into the main tree.

Better to keep it side-by-side with the gyp file which is also in the
main tree.

BUG=None
TEST=gn gen out-gn && ninja -C out-gn sfntly still works
R=vandebo@chromium.org,dpranke@chromium.org

Committed: https://crrev.com/3af9f401d955a957527d0a913736e48dcacb67a7
Cr-Commit-Position: refs/heads/master@{#326121}

[tfarina, 2015-04-20 21:51:25]

PTAL!

[vandebo (ex-Chrome), 2015-04-20 21:53:08]

vandebo@chromium.org changed reviewers:
+ arthurhsu@chromium.org
- vandebo@chromium.org

[vandebo (ex-Chrome), 2015-04-20 21:53:37]

Arthur may be able to review, or know a better reviewer.

[arthurhsu, 2015-04-20 22:29:05]

On 2015/04/20 21:53:37, vandebo (ex-Chrome) wrote:
> Arthur may be able to review, or know a better reviewer.

LGTM

[Dirk Pranke, 2015-04-21 20:37:40]

lgtm

[tfarina, 2015-04-21 21:14:22]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-04-21 21:15:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1090553004/1

[commit-bot: I haz the power, 2015-04-21 21:20:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-21 21:21:48]

Patchset 1 (id:??) landed as
https://crrev.com/3af9f401d955a957527d0a913736e48dcacb67a7
Cr-Commit-Position: refs/heads/master@{#326121}