Need to invalidate scrollbars in case they get repositioned.

If the owning renderer gets resized, the scrollbar may be repositioned. Don't
rely on other reasons for invalidation (background, borders, child content
getting relaid out, etc.) to accidentally get the area covered by the
scrollbars invalidated, since there may very well be no other reason.

BUG=460434
R=jchaffraix@chromium.org,leviw@chromium.org

Review URL: https://codereview.chromium.org/942963002

git-svn-id: svn://svn.chromium.org/blink/trunk@190681 bbb929c8-8fbe-4397-9dbb-9b2b20218538
12 files changed
tree: d4092aaec28b1d653891a056592b481e52254c83
  1. third_party/