Add histograms tracking hit rate of Blink's in-memory cache.

Add histograms tracking hit rate of Blink's in-memory cache.

This is needed to track possible improvements in Blink's in-memory cache.

BUG=290193
R=isherman@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=223617

[Ilya Sherman, 2013-09-16 18:56:49]

LGTM % nit.

https://codereview.chromium.org/24125004/diff/1/tools/metrics/histograms/hist...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/24125004/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:24226: +  <int value="1"
label="HasClient"/>
nit: nit: These labels will show up as human-readable text on the dashboard, so
you might want to use a slightly more human-friendly format like "No client" and
"Has client".  This applies to the other histograms as well.

[Philippe, 2013-09-17 08:45:14]

Thanks Ilya!

https://codereview.chromium.org/24125004/diff/1/tools/metrics/histograms/hist...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/24125004/diff/1/tools/metrics/histograms/hist...
tools/metrics/histograms/histograms.xml:24226: +  <int value="1"
label="HasClient"/>
On 2013/09/16 18:56:49, Ilya Sherman wrote:
> nit: nit: These labels will show up as human-readable text on the dashboard,
so
> you might want to use a slightly more human-friendly format like "No client"
and
> "Has client".  This applies to the other histograms as well.

Done.

[commit-bot: I haz the power, 2013-09-17 08:45:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pliard@chromium.org/24125004/4001

[commit-bot: I haz the power, 2013-09-17 14:36:08]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[Philippe, 2013-09-17 15:17:01]

Committed patchset #3 manually as r223617 (presubmit successful).