Add more asserts about MSAA render buffers and FBO 0

Bug: skia:
Change-Id: I46451b776461cc50f34fa532aa8d070fddb17852
Reviewed-on: https://skia-review.googlesource.com/97102
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed