Use FocusRing RoundRects to match toolbar inkdrops

Creates a SkPath that matches the inkdrop shape and use that as the
focus ring.

In the future, hopefully the inkdrop shape can be generated from the
same path so that they are forced to stay in sync. For now though they
are less separate as the focus ring shape is generated using the same
insets as the inkdrop.

This focus ring is installed for ToolbarButton, BrowserAppMenuButton and
ToolbarActionView (all are visibly toolbar buttons).

Bug: chromium:862925
Change-Id: I898d2d9c6a9e058e9f84aff37615ebf3ab41cee7
Reviewed-on: https://chromium-review.googlesource.com/1139221
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575653}
7 files changed