Linux: --single-process with GPU acceleration.

The GPU process cannot be placed on a UI thread in --single-process mode because glib is not thread safe. This patch moves it onto a IO thread instead.

Connections to the X server are not thread safe. I've made changes so that each thread gets it's own connection.

Finally, GpuHostMsg_GetViewXID needed to be needed to be sent from the thread added to GpuChannel instead of ChildThread::current().

BUG=69674
TEST=try --single-process with --enable-accelerated-layers on http://webkit.org/blog/386/3d-transforms/

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=71655

[jonathan.backer, 2011-01-14 22:03:15]

Having some trouble with the try bots. They don't like the patch (even though
I've rebased off of ToT). Will investigate Monday.

[apatrick_chromium, 2011-01-14 22:50:06]

LGTM once you get the trybots working. Thanks for fixing it.

[amarinichev, 2011-01-14 23:15:54]

Works now, thanks!


On Fri, Jan 14, 2011 at 2:50 PM, <apatrick@chromium.org> wrote:

> LGTM once you get the trybots working. Thanks for fixing it.
>
>
> http://codereview.chromium.org/6340004/
>

[jonathan.backer, 2011-01-17 16:28:27]

On 2011/01/14 22:50:06, apatrick_chromium wrote:
> LGTM once you get the trybots working. Thanks for fixing it.

Problem with the trybots was that LKGR is lagging way behind ToT. By specifying
an appropriate --revision, everything seems to work.