Make requiring VBOs a runtime rather than compile time decision.

Change-Id: I764f8f342ae212df66f647e005ff237c41411b75
Reviewed-on: https://skia-review.googlesource.com/c/179202
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed