[Autofill] Add dark mode Google Pay logo for card upload/unmask

Bug: 924021
Change-Id: I6c2cad595bf0b16d29d229f8805306b8af179a60
Reviewed-on: https://chromium-review.googlesource.com/c/1468781
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#631816}
3 files changed