Make TestCase class in GrShapeTest heap allocate its GrShapes

Uses less stack space in test functions.

Change-Id: I50a66cc27d95c2b4e2292184b928f7bbd71789f0
Reviewed-on: https://skia-review.googlesource.com/121482
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed