currently, we generate from a list of blink features defined here: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in command line flags for individual features: --enable-blinks-features=feat1,feat2,..

Most features end up adding their own flags, so they can appear in about:flags, and then later add a base::Feature to be able to use finch.

I propose to autogenerate base::Feature entries for all features listed RuntimeEnabledFeatures.in so we don't end up with duplicate flags and features all over the place