GitLab

This ensures that cc will rasterize the animating layer at the maximum
scale, to avoid
1. blurriness during scaling-up animations (e.g. scale 1 -> 3),
2. too big raster scale (wasting memory) during small scale animations
(e.g. scale 0.1 -> 0.3).

Previously in the above cases, in simple cases (without ancestor
scales), scale 1 for the layer was used for raterization because
ui::TransformAnimationCurveAdapter failed to provide the maximum scale
of animations.

Also remove unused ui::InverseTransformCurveAdapter.

Bug: 1161586
Change-Id: Ieb876bc271c98627bd61370c93e806b44be0b868
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605242
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844659}