Import wpt@26c3982de252cf8534ef12cb74557e334028cf5e

Using wpt-import in Chromium 4657db0.

Build: https://build.chromium.org/p/chromium.infra.cron/builders/wpt-importer/builds/580

Note to sheriffs: This CL imports external tests and adds
expectations for those tests; if this CL is large and causes
a few new failures, please fix the failures by adding new
lines to TestExpectations rather than reverting. See:
https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md

Directory owners for changes in this CL:
foolip@chromium.org:
  external/wpt/compat
foolip@chromium.org, msisov@igalia.com:
  external/wpt/webvtt
rouslan@chromium.org, mathp@chromium.org:
  external/wpt/payment-request

TBR=qyearsley@chromium.org

No-Export: true
Change-Id: I7a3b94093dd623a113e2e5deed663932ac8c4b99
Reviewed-on: https://chromium-review.googlesource.com/635809
Commit-Queue: Blink WPT Bot <blink-w3c-test-autoroller@chromium.org>
Reviewed-by: Blink WPT Bot <blink-w3c-test-autoroller@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#497451}

third_party/WebKit/LayoutTests/external/WPT_BASE_MANIFEST.json

@@ -120003,6 +120003,11 @@
      {}
     ]
    ],
+   "webvtt/api/VTTCue/common.js": [
+    [
+     {}
+    ]
+   ],
    "webvtt/api/VTTCue/constructor-expected.txt": [
     [
      {}
@@ -273540,7 +273545,7 @@
    "support"
   ],
   "payment-request/payment-request-ctor-currency-code-checks.https.html": [
-   "7efdfa3457fff90fc3f66054505dcf7a7ff4645b",
+   "29a226caa4f91f0b92f4ed8bd99d40e241884107",
    "testharness"
   ],
   "payment-request/payment-request-ctor-pmi-handling.https-expected.txt": [

third_party/WebKit/LayoutTests/external/wpt/payment-request/payment-request-ctor-currency-code-checks.https.html

@@ -162,7 +162,7 @@
     };
     const displayItem = {
       amount,
-      label: "valid currency",
+      label: "invalid currency",
     };
     const details = {
       total: defaultTotal,