Track mouse for cursor and hilites

Change-Id: Icfc8a28fa0c9e3118ef4ddc5ae12162aab3fb484
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/398556
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2 files changed