Add a cap for geometry shader invocations

Bug: skia:7116
Change-Id: I3cc2ce7b2e5123c9adfd9781b2a5a8553747dfa5
Reviewed-on: https://skia-review.googlesource.com/56000
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
9 files changed