[Contacts] Update implementation to match spec changes.

- Expose the `address` property and place it behind a flag.
- Add & implement the getProperties method.

Change-Id: If9bbebde6b8d076fd48b0b8a3584181e40adc1d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835621
Reviewed-by: Stephen White <[email protected]>
Reviewed-by: Peter Beverloo <[email protected]>
Commit-Queue: Rayan Kanso <[email protected]>
Cr-Commit-Position: refs/heads/master@{#702810}

Author: rayankans

contacts/contacts-select.https.window.js

@@ -47,6 +47,17 @@ contactsTestWithUserActivation(async (test, setSelectedContacts) => {
 
 }, 'The Contact API can fail when the selector cannot be opened');
 
+contactsTestWithUserActivation(async (test, setSelectedContacts) => {
+  setSelectedContacts([]);
+
+  const properties = await navigator.contacts.getProperties();
+  assert_true(properties.length > 0);
+
+  // Requesting the available properties should not fail.
+  await navigator.contacts.select(properties);
+
+}, 'Supported contact properties are exposed.');
+
 contactsTestWithUserActivation(async (test, setSelectedContacts) => {
   // Returns two contacts with all information available.
   setSelectedContacts([