Cull tessellated strokes that don't intersect the viewport

When a stroke is zoomed in, it can require an exponential number of
chops. This CL updates the tessellators to stop recursing once a curve
is no longer in the viewport.

Bug: skia:10419
Bug: skia:11268
Bug: skia:9795
Change-Id: I6aad5355618462e88ce6ccccb57c500ae6310f22
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/408576
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
12 files changed