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Change interfaces to use cc::PaintCanvas and SkIRect. Immediately
convert back to gfx types.

Touch up colors so that the diffs in layout tests will be minimized.

Add code to paint the corner. Share this with the track painting code,
and split the track painting code into helper functions for this
purpose.

Bug: 961835
Change-Id: I451f16711afce8e4a0bff5e963f1dc3e06f22410
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896044Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711935}