Cutting out vp9 by removing the files in vp9/ is pretty coarse. A cleaner alternative would be to add configs (under gen_config_files) for this purpose, but that does duplicate a lot of code. What platforms is this required for? If just arm, that's not a whole lot of duplication, but if you want x86/arm/mips and linux/win/mac for each of those, it gets a bit cumbersome.

The main short-term goal is only Android ARM (possibly Android x86 too but definitely not important in the short term). 

If we do only the config approach, won't all objects be compiled anyway? Would VP9 be trimmed away at link time then?

No, I mean adding a configure target with --disable-vp9, which would build a file list which correctly excludes vp9 and has the #defines set correctly

Sounds good. Can you create such gen_config_files configs for that permutation in generate_gypi.sh?

Is it possible or do you want me to do it? Which config do you want? As I've mentioned before, I think the cpu detect version of the arm build should go away.

I created a CL for duplicating the arm-neon and arm64 configurations: https://codereview.chromium.org/1997603002/
Mostly to check that it's possible to do so with the GN build. We can leave this open until there's a real need for this from WebRTC's perspective.

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With recent discussions about making it possible to exclude the VP9 codec in our builds, I'm thinking we might want do to this?
I don't see any variables for either choosing VP8 or VP9 in https://cs.chromium.org/chromium/src/third_party/libvpx/BUILD.gn so I updated the title a bit.

Magnus: what do you say?
If yes, please assign the bug to johannkoenig@ for more input.

You can disable VP9 from the build, rtc_libvpx_build_vp9, and to include/exclude libvpx, rtc_build_libvpx.

There is no flag to disable VP8 wrappers though.

Erik,
Assignign to you for prioritization.