Reland "[Built-In APIs] Enable kAIRelaxUserActivationReqs by default."

This is a reland of commit 145c695c20b8f2d96f8238633cf45624ca0439a0

Original change's description:
> [Built-In APIs] Enable kAIRelaxUserActivationReqs by default.
>
> This change enables the AIRelaxUserActivationReqs feature flag by
> default, relaxing user activation requirements for Built-In AI APIs. The
> virtual test suite and associated tests designed to verify behavior when
> this feature was disabled have been removed. Existing user activation
> tests are updated to reflect that user activation is now present during
> the test execution.
>
> Bug: 454435239
> Change-Id: Ic4b56d6e09bc8ca91f29619faaad409ba9b9c9ca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7186624
> Reviewed-by: Reilly Grant <[email protected]>
> Reviewed-by: Nathan Memmott <[email protected]>
> Reviewed-by: Kent Tamura <[email protected]>
> Commit-Queue: Isaac Ahouma <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#1550111}

Bug: 454435239
Change-Id: Ib5d7e20377af9d6c7f460e97b4fb6264ffafa529
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7212760
Reviewed-by: Reilly Grant <[email protected]>
Reviewed-by: Kent Tamura <[email protected]>
Commit-Queue: Nathan Memmott <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1552994}

Author: Isaac Ahouma

ai/language-model/language-model-create-sticky-user-activation.tentative.https.window.js

@@ -21,9 +21,7 @@ promise_test(async t => {
   await test_driver.bless('Enable LanguageModel create()');
 
   // Consume transient activation.
-  const win = window.open('about:blank', '_blank');
-  if (win)
-    win.close();
+  consumeTransientUserActivation();
   assert_true(navigator.userActivation.hasBeenActive);
   assert_false(navigator.userActivation.isActive);
 

ai/language-model/language-model-create-transient-user-activation.tentative.https.window.js

@@ -15,9 +15,12 @@ promise_test(async t => {
   assert_false(navigator.userActivation.isActive);
   await promise_rejects_dom(t, 'NotAllowedError', LanguageModel.create());
   await test_driver.bless('LanguageModel.create', LanguageModel.create);
+  // User activation is not consumed by the create call.
+  assert_true(navigator.userActivation.isActive);
+  consumeTransientUserActivation();
 
-  // Create does not require user activation when availability is 'available'.
+  // Create does not require transient user activation.
   assert_equals(await LanguageModel.availability(), 'available');
   assert_false(navigator.userActivation.isActive);
   await LanguageModel.create();
-}, 'Create requires user activation when availability is "downloadable"');
+}, 'Create requires sticky user activation when availability is "downloadable"');

ai/language-model/language-model-create-user-activation.tentative.https.window.js

@@ -15,12 +15,15 @@ promise_test(async t => {
   assert_false(navigator.userActivation.isActive);
   await promise_rejects_dom(t, 'NotAllowedError', LanguageDetector.create());
   await test_driver.bless('LanguageDetector.create', LanguageDetector.create);
+  // User activation is not consumed by the create call.
+  assert_true(navigator.userActivation.isActive);
+  consumeTransientUserActivation();
 
-  // Create does not require user activation when availability is 'available'.
+  // Create does not require transient user activation.
   assert_equals(await LanguageDetector.availability(), 'available');
   assert_false(navigator.userActivation.isActive);
   await LanguageDetector.create();
-}, 'Create requires user activation when availability is "downloadable"');
+}, 'Create requires sticky user activation when availability is "downloadable"');
 
 promise_test(async t => {
   const detector = await createLanguageDetector();

ai/language_detection/detector.https.window.js

@@ -287,3 +287,9 @@ async function testCreateAbort(t, createMethod, options, instanceMethods) {
     await promise_rejects_exactly(t, error, promise);
   }
 }
+
+function consumeTransientUserActivation() {
+  const win = window.open('about:blank', '_blank');
+  if (win)
+    win.close();
+}

ai/resources/util.js

@@ -1,5 +1,6 @@
 // META: title=Rewriter Create User Activation
 // META: script=/resources/testdriver.js
+// META: script=../resources/util.js
 // META: timeout=long
 
 'use strict';
@@ -13,9 +14,12 @@ promise_test(async t => {
   assert_false(navigator.userActivation.isActive);
   await promise_rejects_dom(t, 'NotAllowedError', Rewriter.create());
   await test_driver.bless('Rewriter.create', Rewriter.create);
+  // User activation is not consumed by the first create call.
+  assert_true(navigator.userActivation.isActive);
+  consumeTransientUserActivation();
 
-  // Create does not require user activation when availability is 'available'.
+  // Create does not require transient user activation.
   assert_equals(await Rewriter.availability(), 'available');
   assert_false(navigator.userActivation.isActive);
   await Rewriter.create();
-}, 'Create requires user activation when availability is "downloadable"');
+}, 'Create requires sticky user activation when availability is "downloadable"');

ai/rewriter/rewriter-create-user-activation.tentative.https.window.js

@@ -1,5 +1,6 @@
 // META: title=Summarizer Create User Activation
 // META: script=/resources/testdriver.js
+// META: script=../resources/util.js
 // META: timeout=long
 
 'use strict';
@@ -13,9 +14,12 @@ promise_test(async t => {
   assert_false(navigator.userActivation.isActive);
   await promise_rejects_dom(t, 'NotAllowedError', Summarizer.create());
   await test_driver.bless('Summarizer.create', Summarizer.create);
+  // User activation is not consumed by the create call.
+  assert_true(navigator.userActivation.isActive);
+  consumeTransientUserActivation();
 
-  // Create does not require user activation when availability is 'available'.
+  // Create does not require transient user activation.
   assert_equals(await Summarizer.availability(), 'available');
   assert_false(navigator.userActivation.isActive);
   await Summarizer.create();
-}, 'Create requires user activation when availability is "downloadable"');
+}, 'Create requires sticky user activation when availability is "downloadable"');

ai/summarizer/summarizer-create-user-activation.tentative.https.window.js

@@ -1,5 +1,6 @@
 // META: title=Writer Create User Activation
 // META: script=/resources/testdriver.js
+// META: script=../resources/util.js
 // META: timeout=long
 
 'use strict';
@@ -13,9 +14,12 @@ promise_test(async t => {
   assert_false(navigator.userActivation.isActive);
   await promise_rejects_dom(t, 'NotAllowedError', Writer.create());
   await test_driver.bless('Writer.create', Writer.create);
+  // User activation is not consumed by the create call.
+  assert_true(navigator.userActivation.isActive);
+  consumeTransientUserActivation();
 
-  // Create does not require user activation when availability is 'available'.
+  // Create does not require transient user activation.
   assert_equals(await Writer.availability(), 'available');
   assert_false(navigator.userActivation.isActive);
   await Writer.create();
-}, 'Create requires user activation when availability is "downloadable"');
+}, 'Create requires sticky user activation when availability is "downloadable"');