Run snapshot post-layout state every resizeObserver loop iteration

Aligning with proposal 1 in:

whatwg/html#11613 (comment)

Bug: 384523570

Change-Id: I22ac0bb9d9ab8cb5732207105ec61e9aceecd040
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7074836
Commit-Queue: Rune Lillesveen <[email protected]>
Reviewed-by: Anders Hartvoll Ruud <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1534957}

Author: lilles

third_party/blink/renderer/core/frame/local_frame_view.cc

@@ -2379,8 +2379,12 @@ void LocalFrameView::UpdateLifecyclePhasesInternal(
           });
     }
     // Only run the rest of the steps here if resize observer is done.
-    if (needs_to_repeat_lifecycle)
+    if (needs_to_repeat_lifecycle) {
+      if (RuntimeEnabledFeatures::RunSnapshotPostLayoutStateStepsEnabled()) {
+        should_run_scroll_snapshot_client_steps = true;
+      }
       continue;
+    }
 
     // ViewTransition mutates the tree and mirrors post layout transform for
     // transitioning elements to UA created elements. This may dirty

third_party/blink/web_tests/virtual/run-snapshot-post-layout/external/wpt/scroll-animations/css/scroll-timeline-multi-pass.tentative-expected.txt

@@ -0,0 +1,5 @@
+This is a testharness.js-based test.
+[FAIL] Multiple style/layout passes occur when necessary
+  assert_equals: expected 1 but got 2
+Harness: the test ran to completion.
+