In order to apply filterTextFlags correctly, teach
TrackLayerDevice how to process save and restore layers.
At this point, I don't see any other traffic than the
cache warming traffic.
This code has a performance between 82% and 105% of just
drawing the picture.
BUG=skia:7515
Change-Id: I44736be46884f18b6d120d4b5ca582f34dbdff0f
Reviewed-on: https://skia-review.googlesource.com/114641
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
76d69b44bb