cc: Don't analyze masks for solid color.

cc: Don't analyze masks for solid color.

We don't handle masks that are solid color. Also, I suspect that most
masks aren't solid color, so we shouldn't waste time analyzing them.

R=enne, danakj

Committed: https://crrev.com/9c419a4f4834d8f799a0e1f7611314fc56ef6a4e
Cr-Commit-Position: refs/heads/master@{#293606}

[vmpstr, 2014-09-04 20:54:17]

Maybe worth it? Maybe not? Please take a look.

[danakj, 2014-09-04 20:58:29]

LGTM cuz if the mask doesn't have a texture, there's no mask at all.

[vmpstr, 2014-09-05 17:41:05]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2014-09-05 17:42:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/543853002/1

[commit-bot: I haz the power, 2014-09-05 23:44:25]

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

[commit-bot: I haz the power, 2014-09-05 23:44:26]

Exceeded time limit waiting for builds to trigger.

[danakj, 2014-09-05 23:49:55]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-09-05 23:51:33]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/543853002/1

[commit-bot: I haz the power, 2014-09-06 05:53:00]

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

[commit-bot: I haz the power, 2014-09-06 05:53:01]

Exceeded time limit waiting for builds to trigger.

[danakj, 2014-09-06 06:07:00]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-09-06 06:09:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/543853002/1

[commit-bot: I haz the power, 2014-09-06 10:44:40]

Committed patchset #1 (id:1) as c5be262ae21834cf979fcd843b338345d5ed43b4

[commit-bot: I haz the power, 2014-09-10 03:42:16]

Patchset 1 (id:??) landed as
https://crrev.com/9c419a4f4834d8f799a0e1f7611314fc56ef6a4e
Cr-Commit-Position: refs/heads/master@{#293606}