Measure queueing and blocking time for touchstart/touchend.

Measure queueing and blocking time for touchstart/touchend.

Adds histograms for
Event.Latency.QueueingTime.TouchStartDefaultPrevented
Event.Latency.QueueingTime.TouchStartDefaultAllowed
Event.Latency.BlockingTime.TouchStartDefaultPrevented
Event.Latency.BlockingTime.TouchStartDefaultAllowed
Event.Latency.QueueingTime.TouchEndDefaultPrevented
Event.Latency.QueueingTime.TouchEndDefaultAllowed
Event.Latency.BlockingTime.TouchEndDefaultPrevented
Event.Latency.BlockingTime.TouchEndDefaultAllowed

BUG=600730
TEST=RenderWidgetHostLatencyTrackerTest.TouchBlockingAndQueueingTime

Committed: https://crrev.com/018817f3af66b9c084982cb3944d2ce585d00370
Cr-Commit-Position: refs/heads/master@{#399522}

[tdresser, 2016-06-09 14:46:51]

The CQ bit was checked by tdresser@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-06-09 14:47:06]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2051853002/1

[tdresser, 2016-06-09 16:54:07]

tdresser@chromium.org changed reviewers:
+ aelias@chromium.org, isherman@chromium.org

[tdresser, 2016-06-09 16:54:08]

+isherman@ for tools/metrics/histograms/histograms.xml
+aelias@ for
content/browser/renderer_host/input/render_widget_host_latency_tracker*

[aelias_OOO_until_Jul13, 2016-06-09 18:31:50]

lgtm

[Ilya Sherman, 2016-06-10 23:22:37]

LGTM, though you're adding quite a few histograms here.  Please make sure to
come back to these after a few months and clean up any that are not useful
long-term.  Thanks!

https://codereview.chromium.org/2051853002/diff/20001/tools/metrics/histogram...
File tools/metrics/histograms/histograms.xml (left):

https://codereview.chromium.org/2051853002/diff/20001/tools/metrics/histogram...
tools/metrics/histograms/histograms.xml:12104: -    units="microseconds">
Just to confirm, the units previously listed were inaccurate, and there's
otherwise no change to the pre-existing histogram?  If so, LGTM.  If not, then
let's discuss further.

[tdresser, 2016-06-13 18:29:59]

On 2016/06/10 23:22:37, Ilya Sherman wrote:
> LGTM, though you're adding quite a few histograms here.  Please make sure to
> come back to these after a few months and clean up any that are not useful
> long-term.  Thanks!
> 
>
https://codereview.chromium.org/2051853002/diff/20001/tools/metrics/histogram...
> File tools/metrics/histograms/histograms.xml (left):
> 
>
https://codereview.chromium.org/2051853002/diff/20001/tools/metrics/histogram...
> tools/metrics/histograms/histograms.xml:12104: -    units="microseconds">
> Just to confirm, the units previously listed were inaccurate, and there's
> otherwise no change to the pre-existing histogram?  If so, LGTM.  If not, then
> let's discuss further.

That's correct - the units were previously wrong.

I'll definitely review these in a few months, thanks!

[tdresser, 2016-06-13 18:30:03]

The CQ bit was checked by tdresser@chromium.org

[commit-bot: I haz the power, 2016-06-13 18:30:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2051853002/20001

[commit-bot: I haz the power, 2016-06-13 20:23:16]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-13 20:23:24]

CQ bit was unchecked

[commit-bot: I haz the power, 2016-06-13 20:24:21]

Description was changed from

==========
Measure queueing and blocking time for touchstart/touchend.

Adds histograms for
Event.Latency.QueueingTime.TouchStartDefaultPrevented
Event.Latency.QueueingTime.TouchStartDefaultAllowed
Event.Latency.BlockingTime.TouchStartDefaultPrevented
Event.Latency.BlockingTime.TouchStartDefaultAllowed
Event.Latency.QueueingTime.TouchEndDefaultPrevented
Event.Latency.QueueingTime.TouchEndDefaultAllowed
Event.Latency.BlockingTime.TouchEndDefaultPrevented
Event.Latency.BlockingTime.TouchEndDefaultAllowed

BUG=600730
TEST=RenderWidgetHostLatencyTrackerTest.TouchBlockingAndQueueingTime
==========

to

==========
Measure queueing and blocking time for touchstart/touchend.

Adds histograms for
Event.Latency.QueueingTime.TouchStartDefaultPrevented
Event.Latency.QueueingTime.TouchStartDefaultAllowed
Event.Latency.BlockingTime.TouchStartDefaultPrevented
Event.Latency.BlockingTime.TouchStartDefaultAllowed
Event.Latency.QueueingTime.TouchEndDefaultPrevented
Event.Latency.QueueingTime.TouchEndDefaultAllowed
Event.Latency.BlockingTime.TouchEndDefaultPrevented
Event.Latency.BlockingTime.TouchEndDefaultAllowed

BUG=600730
TEST=RenderWidgetHostLatencyTrackerTest.TouchBlockingAndQueueingTime

Committed: https://crrev.com/018817f3af66b9c084982cb3944d2ce585d00370
Cr-Commit-Position: refs/heads/master@{#399522}
==========

[commit-bot: I haz the power, 2016-06-13 20:24:23]

Patchset 2 (id:??) landed as
https://crrev.com/018817f3af66b9c084982cb3944d2ce585d00370
Cr-Commit-Position: refs/heads/master@{#399522}