Enable SDF text when using a perspective matrix.

Also fixes some state issues in SampleApp.

Change-Id: I854754e8b547f7e62aa90914520aaaa20095f965
Reviewed-on: https://skia-review.googlesource.com/20975
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
2 files changed