content: Pass surfacelessness of GL context from GPU to browser

content: Pass surfacelessness of GL context from GPU to browser

Currently we rely on a flag (--ozone-use-surfaceless) to trigger the
surfaceless code path in both GPU & browser processes.

This makes surfacelessness a context capability, so that we can create
the appropriate output surface in the browser without using the flag.

BUG=512631
TEST=Manually on link. UI is drawn.

Committed: https://crrev.com/ba0f0b62c5f73da56dda4d3e0c40092c8da54549
Cr-Commit-Position: refs/heads/master@{#339821}

[spang, 2015-07-22 00:40:29]

spang@chromium.org changed reviewers:
+ piman@chromium.org

[piman, 2015-07-22 01:09:28]

lgtm

[spang, 2015-07-22 01:11:41]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-07-22 01:12:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1243263002/1

[commit-bot: I haz the power, 2015-07-22 02:42:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-22 02:43:28]

Patchset 1 (id:??) landed as
https://crrev.com/ba0f0b62c5f73da56dda4d3e0c40092c8da54549
Cr-Commit-Position: refs/heads/master@{#339821}