BlinkGenPropertyTrees launched!

[Chris Harrelson]

BlinkGenPropertyTrees has launched in M75!

This was a big project for the paint, compositing, animations, and scrolling teams, and has been a long-standing architectural goal of the Chrome compositing system. BlinkGenPropertyTrees is a unification of the compositing data structures which sets us up for a composite-after-paint design, as well as unblocking code deduplication (e.g., scroll unification). There is now no longer a layer tree used by Blink, just a layer list with property trees.

11 bugs were fixed such as crbug.com/400829 (object-fit for video: 19 stars), crbug.com/467484 (composited content in foreignObject: 26 stars), and crbug.com/678669 (border-radius clip escaping). UMA performance data from stable is flat (expected) with one rounded-corner render surface regression (crbug.com/947715, being fixed in M76).

We plan to delete the pre-BGPT code before the M77 branch point.

For more information about BlinkGenPropertyTrees, see this one(-ish) pager:
https://docs.google.com/document/d/17GKr2uIH2O5GthdTyvJpv1qZjoHYoLgrzvCkbCHoID4/view

There was also a GPU brownbag launch retrospective talk:

https://docs.google.com/presentation/d/1GicJmpJIcds2IHwZ-vDDQpNlcbv6Ac-v9Ti4sJPEL5w/view

To check if your browser has BlinkGenPropertyTrees technology, check out https://bgpt.rentals.

Big thanks to everyone who made this launch possible!

[Jeremy Roman]

This is really awesome! Congratulations!

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[Ken Russell]

Fantastic work everybody! This was a huge architectural change and the team did a great job carrying it through to completion over a long period of time.

-Ken

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[Sam Fortiner]

Very cool!  Congrats!

[Emil A Eklund]

Amazing work, congratulations! This not only fixes a number of high
profile bugs but also dramatically improves the rendering
architecture. Can't wait to see what the future holds.