Make --disable-gpu-compositing disable browser compositor as well.

Make --disable-gpu-compositing disable browser compositor as well.

This way --disable-gpu-compositing will force the browser and renderer to use software compositing, but allow webgl to use the GPU process. This is the same mode as SwiftShader uses.

BUG=410515
Committed: https://crrev.com/05d4f3651c8f94ae5efd86be75e3299b28d3e09f
Cr-Commit-Position: refs/heads/master@{#293416}

[jbauman, 2014-09-04 22:38:17]

jbauman@chromium.org changed reviewers:
+ zmo@chromium.org

[Zhenyao Mo, 2014-09-04 22:42:58]

LGTM

[jbauman, 2014-09-04 22:44:01]

The CQ bit was checked by jbauman@chromium.org

[commit-bot: I haz the power, 2014-09-04 22:47:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jbauman@chromium.org/546593002/1

[commit-bot: I haz the power, 2014-09-05 03:15:04]

Committed patchset #1 (id:1) as fbc73e9dbfcf377f84c24dfba08d3b03e140a296

[commit-bot: I haz the power, 2014-09-10 03:36:07]

Patchset 1 (id:??) landed as
https://crrev.com/05d4f3651c8f94ae5efd86be75e3299b28d3e09f
Cr-Commit-Position: refs/heads/master@{#293416}