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This patch integrates SkiaVectorAnimation class with the views
framework. Since most of the code is shared with ImageView, a new
virtual super class is introduced, ImageViewBase. AnimatedImageView is
added as a subclass of this virtual class.

For now the integration class is a very basic view that can play and
stop a given Skia vector animation at a custom size.

This patch also adds an example to views/examples to load animations
and play.

Design doc: go/cros-skottie

Bug: 890221
Change-Id: I55d7310ef74cdfb825cce441c8e61eadff9c5616
Component: Views, examples, skottie, SkiaVectorAnimation
Reviewed-on: https://chromium-review.googlesource.com/c/1262967
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597646}