Use IO loop for the compositor and media threads in the renderer on posix.

Use IO loop for the compositor thread in the renderer on posix.

MessagePumpDefault breaks PostDelayedTask on posix because it uses system time.
MessagePumpIO uses monotonic time, so is immune to these problems.

(These threads because they schedule things with PostDelayedTask).

BUG=293736
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=224074

[piman, 2013-09-18 21:09:58]

-fischman +scherkus

[jamesr, 2013-09-18 21:12:13]

Hm, are there any threads that don't schedule work with PostDelayedTask()? 
Seems like we should either fix or eradicate MessageLoopDefault in this case.

[piman, 2013-09-18 21:14:55]

On Wed, Sep 18, 2013 at 2:12 PM, <jamesr@chromium.org> wrote:

> Hm, are there any threads that don't schedule work with PostDelayedTask()?
> Seems like we should either fix or eradicate MessageLoopDefault in this
> case.
>

I want something mergeable to 30 if needed (this is for a p0
https://code.google.com/p/chrome-os-partner/issues/detail?id=22627 ), and
I'm not confident about the perf implications etc. of changing all the
message loops. But we should clean up afterwards when we decide on the
proper fix, yes.


>
>
https://codereview.chromium.**org/24234002/<https://codereview.chromium.org/2...
>

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[jamesr, 2013-09-18 21:31:09]

lgtm

[scherkus (not reviewing), 2013-09-18 22:23:46]

chatted w/ fischman about this offline

lgtm

[commit-bot: I haz the power, 2013-09-18 22:35:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/piman@chromium.org/24234002/4001

[commit-bot: I haz the power, 2013-09-19 07:18:16]

Change committed as 224074