aura: Remove old GL paths from RenderWidgetHostViewAura.

aura: Remove old GL paths from RenderWidgetHostViewAura.

Frames from the renderer are either legacy software,
software compositing, or ubercomp. Remove the old GL composited
paths that are no longer in use.

For layout tests, put them into composited mailbox mode, and
instead of sending the frame to the browser at all, just put the
frame in a post task to ack back directly to the renderer.

Rebase and fix-up to prevent overloading the GPU process from
https://codereview.chromium.org/131443007/

R=danakj
BUG=332998
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261990

[danakj, 2014-04-04 18:56:24]

Love it, LGTM if the bots like it.

[danakj, 2014-04-04 19:17:21]

Rebased too far forward I think, I sent some tryjobs @HEAD.

[danakj, 2014-04-04 19:24:00]

On 2014/04/04 19:17:21, danakj wrote:
> Rebased too far forward I think, I sent some tryjobs @HEAD.

Can't apply to HEAD, dunno.

[piman, 2014-04-05 01:15:32]

Success, I believe.
The win layout test failures look common to other try runs of other CLs.
Will kick to CQ.

[piman, 2014-04-05 01:15:36]

The CQ bit was checked by piman@chromium.org

[commit-bot: I haz the power, 2014-04-05 01:15:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/piman@chromium.org/225403008/10009

[commit-bot: I haz the power, 2014-04-05 07:53:51]

Change committed as 261990