Bug 1662042 - Shrink RON indents in WebRender captures from 4 spaces to 1 space. r=gw
Bug 1662042 - Shrink RON indents in WebRender captures from 4 spaces to 1 space. r=gw

This greatly reduces the size of the RON files. E.g. in one capture,
`resource.ron` shrunk from 5.8 MB to 2.8 MB.

Differential Revision: https://phabricator.services.mozilla.com/D88758

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/d9c9cb06a6e4e03badeca2552bcdeac9878ecb2f

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender