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This CL adds fast_out_slow_in_interpolator.xml and specifies it as
interpolator for objectAnimators in signin_header_animation.xml.
fast_out_slow_in interpolator from Android resources can't be used here
as it was added in API level 21.

Bug: 814728
Change-Id: If3a7fc8835628f2c0d373b0e0765531dafa8a993
Reviewed-on: https://chromium-review.googlesource.com/1047670Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557028}