how to set default about:flags values during chromium apk build

[109012]

I want to do 2 very simple things and I can't find information on how to do it.

1) Need to set some default flag values to build chromium apk to launch with, baked in. I see several about_flags.cc files, which are pretty convoluted.

2) Need to change some values in apk manifest file. Not sure where that can be done in code.

Please help.

[109012]

I think I found a solution to #1 - a quick way to set default chromium flag values to bake them into a compilation/build.

1) Set default flags to build apk: edit chrome/browser/about_flags.cc, then modify corresponding flag's feature entry so that the default flags_ui has switches::disabled/enabled_whatever, or just replace the default flags_ui with the disabled/enabled flags_ui. 

Now, this will bake the desired chromium flag settings into a compiled build, however, this might cause unusual behavior even when it shouldn't (probably per flag). For example, I disabled GPU rasterization flag by default this way in a chromium-based Brave Browser Android build, the browser loads and works fine, but when I tried flipping the flag to Enabled after launching the apk it crashes the browser.