Add empty files to empty targets to appease XCode.

Add empty files to empty targets to appease XCode.

BUG=skia:4117
Committed: https://skia.googlesource.com/skia/+/46b42f5304e883f6337b4fd435b3dcd63ade3612

[mtklein_C, 2015-08-31 18:52:33]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-31 18:52:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312703004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312703004/1

[mtklein_C, 2015-08-31 18:55:51]

mtklein@chromium.org changed reviewers:
+ reed@google.com

[commit-bot: I haz the power, 2015-08-31 18:58:03]

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

[commit-bot: I haz the power, 2015-08-31 18:58:03]

Dry run: This issue passed the CQ dry run.

[reed1, 2015-08-31 21:19:59]

Fixed my issue, thanks!

lgtm

PS -- lets ask Eric to have a build explicitly use XCode for building (and maybe
VS as well)

[reed1, 2015-08-31 21:20:06]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-08-31 21:20:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312703004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312703004/1

[commit-bot: I haz the power, 2015-08-31 21:21:13]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/46b42f5304e883f6337b4fd435b3dcd63ade3612