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This CL adds the preliminary version of an animated header image for the
new sign-in screen. The header image is added as an animated vector in
signin_header_animation.xml. For older versions of Android API this
animated vector is supported via support library.

Bug: 814728
Change-Id: I394cffbd3dc9c9426a14272dad33a6e6c8e2cd72
Reviewed-on: https://chromium-review.googlesource.com/992933
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548395}