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Defaults to the current emoji ordering from emoji-metadata,
but this will allow smaller emoji data files to be used for tests.

Change-Id: Ibc3ffdeb0c05f7ad9c3880c899c92ef6dc6cbcbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2639713Reviewed-by: John Palmer <jopalmer@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Kenton Lam <kentonlam@google.com>
Cr-Commit-Position: refs/heads/master@{#845403}