GitLab

The shared parts of TabModalPresenter, which include layout inflation,
animations, and some accessibility, are moved into //components.
Chrome-specific specialization is delegated via abstract methods.

Bug: 1045499, 1025256
Change-Id: I2e37561338344495c6ee5cf5e0606c0f76e2c6d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2048846
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742766}