How to get a Histogram from Lacros?

Masami Hiramatsu

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May 2, 2024, 2:24:29 PMMay 2

to tast-users

Hi,

I'm making a test which queries a UMA histogram (Browser.Tabs.TotalSwitchDuration3), which is a browser related one.

But It seems that (chrome) metrics.GetHistogram() fetches the histogram only from Ash. If I enable Lacros, it fails to find the "Browser.Tabs.TotalSwitchDuration3". I guess because the 'tconn' (TestConn) argument is not connected to Lacros.

If it is correct, is there any way to open a TestConn for Lacros?

Thank you,

Georg Neis

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May 6, 2024, 10:15:42 PMMay 6

to Masami Hiramatsu, tast-users

I'm not familiar with the histogram, but you can obtain a TestConn from a Lacros instance just like you obtain it from an Ash instance:

https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/go.chromium.org/tast-tests/cros/local/chrome/lacros/lacros.go;drc=8d6dda0ffa93e6f95fa3168979ab4c8a3936659b;l=179

https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/go.chromium.org/tast-tests/cros/local/chrome/browser/browser.go;drc=6ffdd544590d41d2e2dfc0b5b6aa201c11cf61fa;l=136

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Masami Hiramatsu

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May 8, 2024, 4:44:54 PMMay 8

to Georg Neis, tast-users

Ah, Ok. I need to make a tconn for Lacros instead of Ash. Let me try.

Thanks!

2024年5月7日(火) 11:15 Georg Neis <ne...@google.com>:

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