[SPC] Add Secure Payment Confirmation opt out WPT

Adds chromedriver support and web platform test for opt-out for SPC. The
WPT passes locally with SPC opt out enabled (currently disabled behind a
flag).

There's a small change in the SPC MVC logic, since opt-out can now
happen by calling SPCController::OnOptOut directly, which resulted in
the dialog view calling back to OnCancel when the dialog closes since it
didn't know opt-out was programmatically invoked. This is fixed by
having the controller set a bit on the model which the view checks.

Spec PR: https://github.com/w3c/secure-payment-confirmation/pull/215

Bug: 1385865
Change-Id: I777e92b5110785415de68ef9f0497905598e4897
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4030688
Commit-Queue: Nick Burris <nburris@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1073462}
diff --git a/resources/testharness.js b/resources/testharness.js
index 7ac3632..55aaa58 100644
--- a/resources/testharness.js
+++ b/resources/testharness.js
@@ -2246,7 +2246,8 @@
                 ReadOnlyError: 0,
                 VersionError: 0,
                 OperationError: 0,
-                NotAllowedError: 0
+                NotAllowedError: 0,
+                OptOutError: 0
             };
 
             var code_name_map = {};
diff --git a/secure-payment-confirmation/authentication-optout.https.html b/secure-payment-confirmation/authentication-optout.https.html
new file mode 100644
index 0000000..ea4d18e
--- /dev/null
+++ b/secure-payment-confirmation/authentication-optout.https.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test for the 'secure-payment-confirmation' payment method authentication - user opt out case</title>
+<link rel="help" href="https://w3c.github.io/secure-payment-confirmation/#sctn-user-opt-out">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="utils.sub.js"></script>
+<script>
+'use strict';
+
+promise_test(async t => {
+  const authenticator = await window.test_driver.add_virtual_authenticator(
+      AUTHENTICATOR_OPTS);
+  t.add_cleanup(() => {
+    return window.test_driver.remove_virtual_authenticator(authenticator);
+  });
+
+  await window.test_driver.set_spc_transaction_mode("autooptout");
+  t.add_cleanup(() => {
+    return window.test_driver.set_spc_transaction_mode("none");
+  });
+
+
+  const credential = await createCredential();
+
+  const challenge = 'server challenge';
+  const payeeOrigin = 'https://merchant.com';
+  const displayName = 'Troycard ***1234';
+  const request = new PaymentRequest([{
+    supportedMethods: 'secure-payment-confirmation',
+    data: {
+      credentialIds: [credential.rawId],
+      challenge: Uint8Array.from(challenge, c => c.charCodeAt(0)),
+      rpId: window.location.hostname,
+      payeeOrigin,
+      timeout: 60000,
+      instrument: {
+        displayName,
+        icon: ICON_URL,
+      },
+      showOptOut: true,
+    }
+  }], PAYMENT_DETAILS);
+
+  await test_driver.bless('user activation');
+  return promise_rejects_dom(t, "OptOutError", request.show());
+}, 'SPC opt-out returns OptOutError');
+</script>
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