web_surface_runtime.rs hit 628 lines because it carried four unrelated
concerns:
- session domain types (`WebSurfaceRuntimeScope`, `WebSurfaceSession`,
`WebSurfaceUrlChange`, …) and their config-dir / `session_for_scope`
helpers — these are the runtime's input vocabulary, not its control
flow.
- wire-side glue (scroll-input field marshalling, `pending_input_kind`
classifier, the latency tracing call, and the `From<&Site...>` impl
that lowers permissions to the Servo client) — these are the runtime's
output vocabulary.
- the runtime itself, plus its tests harness.
Split into:
- `web_surface_runtime.rs` (441 lines): WebSurfaceRuntime + Drop.
- `web_surface_runtime_session.rs`: the session types + helpers, with
`pub(super)`-exposed methods so the runtime can drive them.
- `web_surface_runtime_wire.rs`: the wire helpers and the From impl.
`web_surface_runtime` keeps re-exporting the URL-change / frame /
ensure-result types so existing call sites
(`web_surface_state.rs`, `web_surface.rs`, `web_surface_controller.rs`)
need no rewiring.
ZacharyZhang-NY
fc1c0ed8d3