cc: Add a checkerboard trace event instant to picture layer impl.

cc: Add a checkerboard trace event instant to picture layer impl.

This is a small patch that adds a trace event instant whenever we draw
checkerboards. This is useful for debugging or figuring out exactly
when we checkerboarded.

R=enne

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269631

[vmpstr, 2014-05-09 19:11:06]

Please take a look.

[danakj, 2014-05-09 19:20:14]

https://codereview.chromium.org/275173002/diff/1/cc/layers/picture_layer_impl.cc
File cc/layers/picture_layer_impl.cc (right):

https://codereview.chromium.org/275173002/diff/1/cc/layers/picture_layer_impl...
cc/layers/picture_layer_impl.cc:254: TRACE_EVENT_INSTANT0("cc",
This could potentially happen an awful lot during a scroll. Wanna maybe do this
at most once per call to AppendDrawQuads?

[vmpstr, 2014-05-09 19:29:03]

PTAL

https://codereview.chromium.org/275173002/diff/1/cc/layers/picture_layer_impl.cc
File cc/layers/picture_layer_impl.cc (right):

https://codereview.chromium.org/275173002/diff/1/cc/layers/picture_layer_impl...
cc/layers/picture_layer_impl.cc:254: TRACE_EVENT_INSTANT0("cc",
On 2014/05/09 19:20:14, danakj wrote:
> This could potentially happen an awful lot during a scroll. Wanna maybe do
this
> at most once per call to AppendDrawQuads?

Makes sense. Done.

[danakj, 2014-05-09 19:34:40]

LGTM

[danakj, 2014-05-09 19:41:24]

The CQ bit was checked by danakj@chromium.org

[vmpstr, 2014-05-09 19:42:12]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2014-05-09 19:45:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/275173002/20001

[commit-bot: I haz the power, 2014-05-10 20:39:44]

Change committed as 269631