Handle collapsed drawVertices() texture coords gracefully

Detect collapsed coords and implement using a solid color shader.

Replace SkTLazy objects with a stack-based SkArenaAllocator.

Change-Id: I5d867648d551ea30558fd8ae0c99b9292bc92961
Reviewed-on: https://skia-review.googlesource.com/8451
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed