[Web Payment] Very long networkData byte array test.

This patch adds a test for JSON serialization of a very long networkData
byte array passed into PaymentRequest API.

Bug: 1110324, 1115091
Change-Id: I22418541b80205a58d1afc27595a95c7f84715db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348540
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803831}

third_party/blink/web_tests/external/wpt/payment-request/secure-payment-confirmation.https.html

@@ -272,13 +272,30 @@ test(() => {
       supportedMethods: 'secure-payment-confirmation',
       data: {
         action: 'authenticate',
-        // Large instrumentId value.
-        instrumentId: 'x'.repeat(1024 * 1024),
+        // Large credentialIds value.
+        credentialIds: [Uint8Array.from(
+            'x'.repeat(1024 * 1024), c => c.charCodeAt(0))],
         networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
         timeout: 60000,
         fallbackUrl: 'https://fallback.example/url'
       },
     }], details);
   });
-}, 'Large instrumentId value throws exception.');
+}, 'Large credentialIds value throws exception.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        credentialIds: [Uint8Array.from('x', c => c.charCodeAt(0))],
+        // Large networkData value.
+        networkData: Uint8Array.from('x'.repeat(1024 * 1024), c => c.charCodeAt(0)),
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Large networkData value throws exception.');
 </script>