iris: drive animation from painter frame time

app/src/android/bench_client.rs

@@ -669,7 +669,6 @@ async fn run_fling_phase(ctx: &mut iris::task::TaskCtx<Rsc>) -> String {
         ctx.update(|state: &mut BenchClient, rsc| {
             if let Some(screen) = &state.screen {
                 (screen.list)(rsc).fling(FLING_VELOCITY_PX_S);
-                animate_scroll(screen.list, rsc);
             }
         });
         wait_for_fling_settle(ctx).await;
@@ -700,11 +699,6 @@ async fn read_anchor_position(ctx: &mut iris::task::TaskCtx<Rsc>) -> String {
     .await
 }
 
-fn animate_scroll(scroll: iris::prelude::WeakWidget<iris::prelude::LazySpan>, rsc: &mut Rsc) {
-    let id = scroll.id();
-    rsc.ui_mut().animate(id);
-}
-
 async fn wait_for_fling_settle(ctx: &mut iris::task::TaskCtx<Rsc>) {
     let cap = Duration::from_millis(FLING_SETTLE_CAP_MS);
     let started = Instant::now();