Added bullet proofing to WrappedProxyConversionTest

Change-Id: I8a3f023b2e81d0f3224022a9a5e3a37bc0b37f64
Reviewed-on: https://skia-review.googlesource.com/99041
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed