Change generateAdvance to never chain.

Now set to bool generateAdvance(SkGlyph*)

Change-Id: I48bda7858d4c5d90edcf7b7af810d0da56ae0dd9
Reviewed-on: https://skia-review.googlesource.com/146537
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Bruce Wang <brucewang@google.com>
13 files changed