Chromium Android command line switches at build

[Devin Arthur]

Hi all - is it possible to pass command line switches at build/compile time so you don't need to enable them in chrome://flags after the fact?

If so, how can this be done? I could not find any documentation for this.

Thanks! :)

[PhistucK]

Probably. :)

Use cs.chromium.org to search the code that adds the flags that are enabled in about:flags and just add yours.

I would start by searching "--flag-switches-begin" (the quotes are important, otherwise it is a negated query).

☆PhistucK

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[Devin Arthur]

Thanks, I did find some code with that line, but I am having trouble finding where the scripts pull those flags from (sorry I am fairly new to this so if I am blind let me know).

☆PhistucK

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[Steve Kobes]

Not quite what you asked for, but note that Chrome for Android reads flags from a file in /data/local.  For development we have scripts like adb_chrome_public_command_line to set them, which is much easier than using the chrome://flags UI on the device.

[PhistucK]

Well, you asked about adding the flags at build time. I see that this is the earliest call to append command line flags -

https://cs.chromium.org/chromium/src/chrome/browser/chrome_browser_main.cc?sq=package:chromium&dr=C&rcl=1482322769&l=1036

Regarding the storage, it is stored in the Local State file in the profile directory (at least on Windows).

☆PhistucK

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[Devin Arthur]

Thanks, I did see that script but you need to run that after installation to generate the file - I guess I could always find a way to include that file in my apk install since I am trying to get some flags enabled by default rather than having to enable them after install.

[Tommy Nyquist]

You might also have some luck by setting it in code instead, like here SetChromeSpecificCommandLineFlags in //chrome/browser/android/chrome_startup_flags.cc.