PSA: runtime_enabled_features.json5 improvements

[TAMURA, Kent]

* blink::WebRuntimeFeatures methods generation

You can generate methods of blink::WebRuntimeFeatures for a feature entry in runtime_enabled_features.json5 by adding `public: true,`.

* base::Feature generation

You can generate a base::Feature instance in blink::features namespace for a feature entry in runtime_enabled_features.json5 by adding `base_feature: "feature-name",`.

You can't use it for a base::Feature not in blink::features.

https://chromium.googlesource.com/chromium/src/+/main/third_party/blink/renderer/platform/RuntimeEnabledFeatures.md#generate-a-instance-from-a-blink-feature

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TAMURA Kent
Software Engineer, Google

[Ian Clelland]

I ran into one of these in the wild, in a code review yesterday. It's a huge win for reducing boilerplate code for new features (especially those entering an Origin Trial, which usually need extra browser flags over and above whatever blink-side control they already implement)

Thanks for doing this!

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[Yoav Weiss]

That's amazing! Thank you for reducing the amount of boilerplate and hoops Chromium devs have to jump through to enable experimentation!!

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