Sample not RefCnted; ClickHandling moved out of viewer

Change-Id: I23456144b267192928a1253692daf846329f2ab5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227067
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
20 files changed