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 - Provides "customSort" function to scanning select elements that use
   the select behavior. "customSort" should cover all custom sorting needs by
   allowing callers to provide their own comparison function and an
   optional conversion function that can be used to sort on any field.

Bug: 1059779
Test: browser_tests --gtest_filter=ScanningAppBrowserTest.All
Change-Id: I8bed8c9b2c70f066ac219fcd2c10f17063c9489d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518237
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825084}