use textonpath util for canvas::drawTextOnPath

- slight change in pixels
- will allow us to remove lots of virtuals

Bug: skia:7554
Change-Id: I8f95c07bf67760824d9d9bf59c28f11835971d4b
Reviewed-on: https://skia-review.googlesource.com/149683
Commit-Queue: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed