SkCanvas::resetForNextPicture() No diffs against head for DM --config 8888 gpu 2ndpic-8888 2ndpic-gpu. picture_overhead_draw 1.62us -> 1.6us 0.99x picture_overhead_nodraw 792ns -> 342ns 0.43x tiles and serialization modes will also test this a bit. BUG=chromium:470553 Committed: https://skia.googlesource.com/skia/+/f920e468ac66a36c9653d1b11181480295044c7d Review URL: https://codereview.chromium.org/1067893002