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This CL adds Signin.AndroidGetAccountIdsTime histogram that tracks how
much time it takes to get account ids for all accounts on the device.

Bug: 906713
Change-Id: Ie59e815fcb469ced15fe308378e7c3fbc07d776a
Reviewed-on: https://chromium-review.googlesource.com/c/1342997
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610376}