[Partitioned Popins] Implement popinContextType() JS API

This CL implements `window.popinContextType()` that tells whether a page is inside of a Partitioned Popin. Explainer: https://explainers-by-googlers.github.io/partitioned-popins/ I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/ApU_zUmpQ2g/ Low-Coverage-Reason: COVERAGE_UNDERREPORTED Tested through WPTs. Bug: 340606651 Bug: b/362973178 Change-Id: I053512217160d4875e7558be35eda3a3bbace833 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5826165 Reviewed-by: Ari Chivukula <[email protected]> Reviewed-by: Robert Kaplow <[email protected]> Reviewed-by: Daniel Cheng <[email protected]> Commit-Queue: Sandor «Alex» Major <[email protected]> Cr-Commit-Position: refs/heads/main@{#1350877}
web-platform-tests · Sep 4, 2024 · a154121 · a154121
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diff --git a/partitioned-popins/popinContextType.in-popin.tentative.https.window.js b/partitioned-popins/popinContextType.in-popin.tentative.https.window.js
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+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Spec: https://explainers-by-googlers.github.io/partitioned-popins/
+// Step 1 (window) Set up listener to resolve messages as they come in.
+// Step 2 (window) Open popin.
+// Step 3 (popin) Call `window.popinContextType()` and send result to opener.
+// Step 4 (main-window) Assert and cleanup.
+
+async_test(t => {
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+    switch (e.data.type) {
+      case 'popin':
+        // Step 4
+        assert_equals(e.data.message, "partitioned");
+        t.done();
+        break;
+    }
+  }));
+
+  // Step 2
+  window.open("/partitioned-popins/resources/popinContextType.html", '_blank', 'popin');
+}, "Verify PopinContextType is 'partitioned' in a Partitioned Popin");
diff --git a/partitioned-popins/popinContextType.tentative.https.window.js b/partitioned-popins/popinContextType.tentative.https.window.js
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+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Spec: https://explainers-by-googlers.github.io/partitioned-popins/
+// Step 1 - Call `window.popinContextType()` and receive null.
+
+async_test(t => {
+  assert_equals(window.popinContextType(), null);
+  t.done();
+}, "Verify PopinContextType is null on top-level page");
diff --git a/partitioned-popins/resources/popinContextType.html b/partitioned-popins/resources/popinContextType.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  (async function () {
+    test_driver.set_test_context(window.opener);
+
+    // Step 3 (partitioned-popins/popinContextType.in-popin.tentative.sub.https.window.js)
+    let message = "popinContextType is not supported";
+    try {
+      message = window.popinContextType();
+    } catch (_) { }
+    window.opener.postMessage({ type: "popin", message: message }, "*");
+    window.close();
+  })();
+</script>