document.domain setting should be ignored when cross-origin isolated

Bug: 1058309
Change-Id: Icb86941037a48ef476cff0c6c41c11d76423f19f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417872
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810149}

third_party/blink/renderer/core/dom/document.cc

@@ -5928,6 +5928,16 @@ void Document::setDomain(const String& raw_domain,
     return;
   }
 
+  if (RuntimeEnabledFeatures::CrossOriginIsolationEnabled() &&
+      Agent::IsCrossOriginIsolated()) {
+    AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
+        mojom::blink::ConsoleMessageSource::kSecurity,
+        mojom::blink::ConsoleMessageLevel::kWarning,
+        "document.domain mutation is ignored because the surrounding agent "
+        "cluster is cross-origin isolated."));
+    return;
+  }
+
   if (GetFrame()) {
     UseCounter::Count(*this,
                       dom_window_->GetSecurityOrigin()->Port() == 0

third_party/blink/web_tests/external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub-expected.txt

-This is a testharness.js-based test.
-FAIL SharedArrayBuffer and a same-origin-domain (but not same-origin) iframe assert_equals: expected "www1.web-platform.test" but got "web-platform.test"
-Harness: the test ran to completion.
-