[devtools] Add inspector protocol test for new COEP error reporting

The error reporting was landed recently here:
https://chromium-review.googlesource.com/c/chromium/src/+/2070409

This CL adds a layout test that checks that the new errors are actually
reported via the Chrome DevTools Protocol (CDP).

Note that this test relies on the --cross-origin-isolation flag to
be turned on, which it is for layout tests, and we don't expect it
to be turned off. If the flag gets turned off, this test will fail
and needs to be disabled.

Bug: chromium:1051473
Change-Id: Iaccb843923ae1b2654ea11f3eec3f5b04bd1d551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087913
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746779}

third_party/blink/web_tests/http/tests/inspector-protocol/network/cross-origin-isolation/coep-load-error-reporting-expected.txt

+Tests that cross-origin embedder policy (COEP) related blocking is reported correctly.
+https://devtools.test:8443/inspector-protocol/network/cross-origin-isolation/resources/coep-page-with-resources.php: *loading finished*
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-origin-after-defaulted-to-same-origin-by-coep
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=cross-origin: *loading finished*
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=same-site: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-site
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=same-origin: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-origin
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php: net::ERR_BLOCKED_BY_RESPONSE coep-frame-resource-needs-coep-header
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-origin-after-defaulted-to-same-origin-by-coep
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep&corp=same-site: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-site
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep&corp=same-origin: net::ERR_BLOCKED_BY_RESPONSE corp-not-same-origin
+https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php&coop: net::ERR_BLOCKED_BY_RESPONSE coep-frame-resource-needs-coep-header
+

third_party/blink/web_tests/http/tests/inspector-protocol/network/cross-origin-isolation/coep-load-error-reporting.js

+(async function(testRunner) {
+  const {page, session, dp} = await testRunner.startBlank(
+      `Tests that cross-origin embedder policy (COEP) related blocking is reported correctly.`);
+
+  await session.protocol.Network.clearBrowserCache();
+  await session.protocol.Network.setCacheDisabled({cacheDisabled: true});
+  await dp.Target.setAutoAttach({autoAttach: true, waitForDebuggerOnStart: true, flatten: true});
+
+  let numberOfMessages = 0;
+  const expectedNumberOfMessages = 21;
+  const resources = new Map();
+
+  function record(requestId, info) {
+    resources.set(requestId, {...resources.get(requestId), ...info});
+
+    if (++numberOfMessages === expectedNumberOfMessages) {
+      function compareInfo(a, b) {
+        return a.requestWillBeSent?.request?.url < b.requestWillBeSent?.request?.url;
+      }
+      const entries = Array.from(resources.values()).sort(compareInfo);
+      for (const entry of entries) {
+        if (entry.loadingFailed) {
+          testRunner.log(`${entry.requestWillBeSent.request?.url}: ${entry.loadingFailed.errorText} ${entry.loadingFailed.blockedReason}`);
+        }
+        if (entry.loadingFinished) {
+          testRunner.log(`${entry.requestWillBeSent.request?.url}: *loading finished*`);
+        }
+      }
+      testRunner.completeTest();
+    }
+  }
+
+  async function initalizeTarget(dp) {
+    dp.Network.onLoadingFailed(event => record(event.params.requestId, {loadingFailed: event.params})),
+    dp.Network.onLoadingFinished(event => record(event.params.requestId, {loadingFinished: event.params})),
+    dp.Network.onRequestWillBeSent(event => record(event.params.requestId, {requestWillBeSent: event.params})),
+    await Promise.all([
+      dp.Network.enable(),
+      dp.Page.enable()
+    ]);
+  }
+
+  await initalizeTarget(dp);
+
+  dp.Target.onAttachedToTarget(async e => {
+    const dp = session.createChild(e.params.sessionId).protocol;
+    await initalizeTarget(dp);
+  });
+
+  page.navigate('https://devtools.test:8443/inspector-protocol/network/cross-origin-isolation/resources/coep-page-with-resources.php');
+
+  // `record` above makes sure to complete the test.
+})
+

third_party/blink/web_tests/http/tests/inspector-protocol/network/cross-origin-isolation/resources/coep-page-with-resources.php

+<?php
+
+header("Cross-Origin-Embedder-Policy: require-corp");
+
+?>
+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>Page with Cross-Origin-Embedder-Policy</title>
+    <meta charset="utf-8">
+  </head>
+  <body>
+    <div>
+      This is a COEP page embedding resources.
+    </div>
+    None/None<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php">
+    </iframe><br/>
+    COEP/None<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep">
+    </iframe><br/>
+    COEP/Same-Site<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep&corp=same-site">
+    </iframe><br/>
+    COEP/Same-Origin<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep&corp=same-origin">
+    </iframe><br/>
+    COEP/Cross-Origin<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?coep&corp=cross-origin">
+    </iframe><br/>
+    Script CORP None <span id="script-corp-none">not loaded</span>
+    <script src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php" defer>
+    </script><br/>
+    Script CORP cross origin <span id="script-corp-cross-origin">not loaded</span>
+    <script src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=cross-origin" defer>
+    </script>    <br/>
+    Script CORP same site <span id="script-corp-same-site">not loaded</span>
+    <script src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=same-site" defer>
+    </script><br/>
+    Script CORP same origin <span id="script-corp-same-origin">not loaded</span>
+    <script src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php?corp=same-origin" defer>
+    </script><br/>
+    Sandboxed COOP iframe<br/>
+    <iframe src="https://devtools.oopif.test:8443/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php&coop">
+    </iframe><br/>
+  </body>
+</html>
+

third_party/blink/web_tests/http/tests/inspector-protocol/network/cross-origin-isolation/resources/page-with-coep-corp.php

+<?php
+
+if (isset($_GET['corp'])) {
+  header("Cross-Origin-Resource-Policy: " . $_GET['corp']);
+}
+
+if (isset($_GET['coop'])) {
+  header("Cross-Origin-Opener-Policy: same-origin");
+}
+
+
+if (isset($_GET['coep'])) {
+  header("Cross-Origin-Embedder-Policy: require-corp");
+}
+
+echo "This is some content";
+
+?>