textonpath no longer in canvas

Prev behavior available via utils SkDrawTextOnPath

Bug: skia:7554
Change-Id: I3d71963c632cc947e418757bb83cdc18ec3b184e
Reviewed-on: https://skia-review.googlesource.com/150123
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
23 files changed