cc: Allow transparent layers with background filters to render

cc: Allow transparent layers with background filters to render

If we have a background filter, we still need to render the fully
transparent stuff since the filter will still change what's beneath it.

+test

BUG=497522
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/c266f7bac110aebada963292e67c51fd3195bb9a
Cr-Commit-Position: refs/heads/master@{#344912}

[hendrikw, 2015-08-20 23:38:02]

hendrikw@chromium.org changed reviewers:
+ enne@chromium.org

[hendrikw, 2015-08-20 23:38:03]

PTAL, thanks!

[enne (OOO), 2015-08-21 17:36:20]

lgtm

[hendrikw, 2015-08-21 17:36:35]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2015-08-21 17:37:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307713002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307713002/20001

[commit-bot: I haz the power, 2015-08-21 20:40:12]

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

[commit-bot: I haz the power, 2015-08-21 20:40:13]

Try jobs failed on following builders:
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_android_r...)

[hendrikw, 2015-08-21 20:50:22]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2015-08-21 20:51:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307713002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307713002/20001

[commit-bot: I haz the power, 2015-08-21 23:41:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-21 23:42:49]

Patchset 2 (id:??) landed as
https://crrev.com/c266f7bac110aebada963292e67c51fd3195bb9a
Cr-Commit-Position: refs/heads/master@{#344912}