Split src/opts source lists out of opts.gyp.

Split src/opts source lists out of opts.gyp.

This should make it easier to keep our opts.gyp in sync with Chrome's GYP and GN.

BUG=skia:

Landing this without review as a mega-tryjob.
TBR=reed@google.com

Committed: https://skia.googlesource.com/skia/+/c98fe3aa4f8c97c462c0eb6d9106fc37e48d7f82

Committed: https://skia.googlesource.com/skia/+/f7069d58fc7b323437e8a65a82d5d839e92c9ffe

[mtklein, 2015-01-27 01:58:31]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-01-27 01:59:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870353003/1

[commit-bot: I haz the power, 2015-01-27 02:05:43]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/c98fe3aa4f8c97c462c0eb6d9106fc37e48d7f82

[mtklein, 2015-01-27 02:14:12]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/880783002/ by mtklein@google.com.

The reason for reverting is: Android Makefiles broken.

[mtklein, 2015-01-27 02:29:09]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-01-27 02:29:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870353003/20001

[mtklein, 2015-01-27 02:55:44]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-01-27 02:55:45]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-01-27 02:55:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870353003/20001

[commit-bot: I haz the power, 2015-01-27 02:56:04]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/f7069d58fc7b323437e8a65a82d5d839e92c9ffe