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This CL generalizes helper functions used in the following tests
* PasswordAccessoryControllerTest,
* AddressAccessoryControllerTest (https://crrev.com/c/1614200), and
* CreditCardAccessoryControllerTest (https://crrev.com/c/1599927)

Bug: None.
Change-Id: Ief1ad6cb78e14d558e2202cf874d8dbbaa54e9fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1615464
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662212}