Fix DrawFunctions fuzzer to initialize bitmaps

Patch by twsmith@mozilla.com

BUG=skia:5997

Change-Id: I3d4edd9fa5c8f5f2a5184d42b1c4944a1353556f
Reviewed-on: https://skia-review.googlesource.com/5304
Reviewed-by: twsmith@mozilla.com <twsmith@mozilla.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
1 file changed