cc: Use refresh_rate from LayerTreeSettings

cc: Use refresh_rate from LayerTreeSettings

We use it in compositor_unittests to have a faster refresh rate during test
(when WGC3D is mocked out --- no hardware vsync).

TEST=cc_unittests pass, compositor_unittests --ui-enable-threaded-compositing are faster

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=192676

[jonathan.backer, 2013-04-05 14:38:42]

I'd like to use or nuke the setting. I think there's some value in keep it,
because it'll make a subset of the compositor_unittests run faster.

[danakj, 2013-04-05 14:44:00]

LGTM

Do you know how this plays out with plumbing the vsync info into the renderer?
is that going to remove this setting then?

[danakj, 2013-04-05 14:45:25]

We could use this to speed up cc unit tests too. The LayerTreeTest class could
initialize this value to be much lower.

What value are you using the ui unittests?

[jonathan.backer, 2013-04-05 14:58:24]

On 2013/04/05 14:44:00, danakj wrote:
> LGTM
> 
> Do you know how this plays out with plumbing the vsync info into the renderer?
> is that going to remove this setting then?

It doesn't --- it just sets a default. Real info probed at runtime will override
the default via an IPC. We'll get a hit on
OutputSurfaceClient::OnVSyncParametersChanged (LTHI), which will percolate to
FrameRateController::SetTimebaseAndInterval.

[jonathan.backer, 2013-04-05 15:14:56]

On 2013/04/05 14:45:25, danakj wrote:
> We could use this to speed up cc unit tests too. The LayerTreeTest class could
> initialize this value to be much lower.

Done.

> What value are you using the ui unittests?

We were "using" (not hooked up) 100Hz. I just bumped it to 200Hz. That seems to
be a point of diminishing returns.

[danakj, 2013-04-05 15:16:30]

Cool, thanks! LGTMstill

[commit-bot: I haz the power, 2013-04-05 18:58:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/backer@chromium.org/13674006/7003

[commit-bot: I haz the power, 2013-04-06 00:47:06]

Change committed as 192676