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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/

Review URL: http://codereview.chromium.org/6340004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71655 0039d316-1c4b-4281-b951-d872f2087c98