Very tiny paths are subsumed by the Convexicator
and are treated as convex when they are not.

Allow the SkPath::Iter to leave degenerate path
segments unmolested by passing an additional exact
bool to next().

Treat any non-zero length as significant in addPt().

R=reed@google.com,robertphillips@google.com
BUG=493450

Review URL: https://codereview.chromium.org/1228383002
4 files changed