Linux: add BPF sandbox status in about:sandbox

Linux: add BPF sandbox status in about:sandbox

This adds the status of the BPF sandbox in about:sandbox. This is of
course pretty limited because the real status depends on the process type.

We assume renderers.

BUG=
TBR=joi@chromium.org
NOTRY=true

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=149896

[jln (very slow on Chromium), 2012-08-03 00:36:19]

Small CL that uses the recent refactors to finally be able to surface the BPF
sandbox status in about:sandbox.

[jln (very slow on Chromium), 2012-08-03 00:43:01]

On 2012/08/03 00:36:19, Julien Tinnes wrote:
> Small CL that uses the recent refactors to finally be able to surface the BPF
> sandbox status in about:sandbox.

Erik: since this is a small and simple CL, I'm adding you ahead of time for
ui/webui/ approval.

[Jorge Lucangeli Obes, 2012-08-03 17:27:06]

lgtm

[arv (Not doing code reviews), 2012-08-03 18:02:34]

LGTM rubber stamp

[Markus (顧孟勤), 2012-08-03 19:09:33]

lgtm

[commit-bot: I haz the power, 2012-08-03 19:12:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jln@chromium.org/10829156/6001

[commit-bot: I haz the power, 2012-08-03 19:39:19]

Try job failure for 10829156-6001 (retry) on linux_chromeos for step "compile"
(clobber build).
It's a second try, previously, step "compile" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[commit-bot: I haz the power, 2012-08-03 19:48:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jln@chromium.org/10829156/6001

[commit-bot: I haz the power, 2012-08-03 19:48:45]

Change committed as 149896