Shared Storage

The tests are run with the flag:

--enable-features=
  SharedStorageAPI,
  FencedFrames:implementation\_type/mparch,
  PrivacySandboxAdsAPIsOverride,
  FencedFramesAPIChanges

You can run these tests by targeting the following directory: `virtual/shared-storage-fenced-frame-mparch/wpt_internal/shared_storage.

The FencedFramesAPIChanges feature is enabled for user to specify the behavior of selectURL by changing the boolean field resolveToConfig of SharedStorageRunOperationMethodOptions:

1. sharedStorage.selectURL('foo', [{url: "bar.com"}], {data: {'option': 0}}); resolves to an urn::uuid.
2. sharedStorage.selectURL('foo', [{url: "bar.com"}], {data: {'option': 0}, resolveToConfig: false}); resolves to an urn::uuid.
3. sharedStorage.selectURL('foo', [{url: "bar.com"}], {data: {'option': 0}, resolveToConfig: true}); resolves to a fenced frame config object.

See crbug.com/1218540 and crbug.com/1347953.