[Backport] Use compositor with select popups.

BUG=271575

Review URL: https://codereview.chromium.org/132173005

git-svn-id: svn://svn.chromium.org/blink/trunk@165977 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Change-Id: I78b3354b1040b193c984b82db51c90b8183ebd24
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>