orchestrates style → layout → pre‑paint/paint for a frame. This is the workhorse that actually runs lifecycle phases. On a frame tick from WebFrameWidgetImpl, it goes through style recalc, layout (LayoutNG), pre‑paint (build property trees, invalidation), paint (record display list), and then kicks compositing with the new artifact. It also wires in PaintArtifactCompositor and traversal helpers like PrePaintTreeWalk. (Chromium Git Repositories)

Most important collaborations

* Includes/uses: PrePaintTreeWalk, PaintArtifactCompositor, GraphicsContext, PaintController. These glue together pre‑paint traversal, display list recording, and handoff to compositing. (Chromium Git Repositories)

Hands off to: Document (style), LayoutNG fragments, PrePaintTreeWalk, PaintController, then PaintArtifactCompositor.