am 159f22e8: am 92e4a90e: (-s ours) am 17e38ec9: DO NOT MERGE Prevent integer wrap around for malloc size when creating a SkRegion

* commit '159f22e83dd74d08b39bdd5ad1cd1db46bd6ad1d':
  DO NOT MERGE Prevent integer wrap around for malloc size when creating a SkRegion