Use new SkGlyphIDSet - v2

Add bzero to make msan and valgrind happy.

Change-Id: I9b4e2f2b8e690da4b4b920fef27d5a8854092219
Reviewed-on: https://skia-review.googlesource.com/140563
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed