Prevent squashing into your own compositing container

Prevent squashing into your own compositing container

If you squash on to your compositing container, you'll draw in the wrong order
because you'll draw after other RenderLayers that come after you in paint order
into your compositing container.

R=chrishtr@chromium.org
BUG=370862
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173709

[chrishtr, 2014-05-09 00:19:22]

lgtm

[abarth-chromium, 2014-05-09 00:24:38]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-05-09 00:25:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/abarth@chromium.org/277763002/20001

[commit-bot: I haz the power, 2014-05-09 01:34:44]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/7015)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/6261)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/6727)

[commit-bot: I haz the power, 2014-05-09 02:13:28]

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

[commit-bot: I haz the power, 2014-05-09 02:13:29]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/6736)

[abarth-chromium, 2014-05-09 02:45:05]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-05-09 02:46:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/abarth@chromium.org/277763002/20001

[commit-bot: I haz the power, 2014-05-09 03:34:18]

Change committed as 173709