Add missing worklet referrer tests

This CL adds more web-platform-tests for the `Referer` on worklet
descendant requests. This CL introduces tests where we fetch a
same-origin descendant script from a cross-origin worklet script served
with varying referrer policies.

The tests are similar to those introduced in crrev.com/c/1809205 for
module scripts, and will pass once crrev.com/c/1808663 is merged.

R=ikilpatrick@chromium.org, kouhei@chromium.org

Bug: 786862,1004083
Change-Id: I4425be4264424b52e4ec307513a404541869f2a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813122
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699351}

worklets/resources/import-same-origin-referrer-checker-worklet-script-from-remote-origin.sub.js

@@ -0,0 +1,2 @@
+// Forward GET parameters to the server.
+import '{{GET[requestor_origin]}}/worklets/resources/referrer-checker.py?referrer_policy={{GET[referrer_policy]}}&expected_referrer={{GET[expected_referrer]}}';

worklets/resources/import-same-origin-referrer-checker-worklet-script-from-remote-origin.sub.js.headers

@@ -0,0 +1 @@
+Access-Control-Allow-Origin: *

worklets/resources/referrer-tests.js

@@ -88,6 +88,7 @@ function runReferrerTests(workletType) {
 
   // Tests for descendant script fetch -----------------------------------------
 
+  // Referrer policy: no-referrer.
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -106,6 +107,15 @@ function runReferrerTests(workletType) {
   }, 'Importing a remote-origin script from a same-origin worklet script ' +
      'that has "no-referrer" referrer policy should not send referrer.');
 
+  promise_test(() => {
+    return runReferrerTest({ workletType: workletType,
+                             fetchType: 'descendant',
+                             referrerPolicy: 'no-referrer',
+                             scriptOrigins: { topLevel: 'remote',
+                                              descendant: 'same' } });
+  }, 'Importing a same-origin script from a remote-origin worklet script ' +
+     'that has "no-referrer" referrer policy should not send referrer.');
+
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -115,6 +125,7 @@ function runReferrerTests(workletType) {
   }, 'Importing a remote-origin script from a remote-origin worklet script ' +
      'that has "no-referrer" referrer policy should not send referrer.');
 
+  // Referrer policy: origin.
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -133,6 +144,15 @@ function runReferrerTests(workletType) {
   }, 'Importing a remote-origin script from a same-origin worklet script ' +
      'that has "origin" referrer policy should send referrer.');
 
+  promise_test(() => {
+    return runReferrerTest({ workletType: workletType,
+                             fetchType: 'descendant',
+                             referrerPolicy: 'origin',
+                             scriptOrigins: { topLevel: 'remote',
+                                              descendant: 'same' } });
+  }, 'Importing a same-origin script from a remote-origin worklet script ' +
+     'that has "origin" referrer policy should send referrer.');
+
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -142,6 +162,7 @@ function runReferrerTests(workletType) {
   }, 'Importing a remote-origin script from a remote-origin worklet script ' +
      'that has "origin" referrer policy should send referrer.');
 
+  // Referrer policy: same-origin.
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -160,6 +181,15 @@ function runReferrerTests(workletType) {
   }, 'Importing a remote-origin script from a same-origin worklet script ' +
      'that has "same-origin" referrer policy should not send referrer.');
 
+  promise_test(() => {
+    return runReferrerTest({ workletType: workletType,
+                             fetchType: 'descendant',
+                             referrerPolicy: 'same-origin',
+                             scriptOrigins: { topLevel: 'remote',
+                                              descendant: 'same' } });
+  }, 'Importing a same-origin script from a remote-origin worklet script ' +
+     'that has "same-origin" referrer policy should send referrer.');
+
   promise_test(() => {
     return runReferrerTest({ workletType: workletType,
                              fetchType: 'descendant',
@@ -168,4 +198,6 @@ function runReferrerTests(workletType) {
                                               descendant: 'remote' } });
   }, 'Importing a remote-origin script from a remote-origin worklet script ' +
      'that has "same-origin" referrer policy should not send referrer.');
+
+  // TODO(domfarolino): Add tests for more referrer policies.
 }

worklets/resources/referrer-window.html

@@ -31,6 +31,14 @@
         'import-remote-origin-referrer-checker-worklet-script.sub.js',
         location.href);
   }
+  if (scriptOrigins.topLevel === 'remote' &&
+      scriptOrigins.descendant === 'same') {
+    url = new URL(
+        get_host_info().HTTPS_REMOTE_ORIGIN +
+        '/worklets/resources/' +
+        'import-same-origin-referrer-checker-worklet-script-from-remote-origin.sub.js');
+    return url;
+  }
   if (scriptOrigins.topLevel === 'remote' &&
       scriptOrigins.descendant === 'remote') {
     return new URL(
@@ -88,6 +96,7 @@
   }
 
   const params = new URLSearchParams;
+  params.append('requestor_origin', document.location.origin);
   params.append('referrer_policy', referrerPolicy);
   params.append('expected_referrer', expectedReferrer);