Allow `null` arguments in `gl.buffer{,Sub}Data(...)`
Allow `null` arguments in `gl.buffer{,Sub}Data(...)`

fbshipit-source-id: 8e74593

exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,jolicloud/exponent,jolicloud/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,jolicloud/exponent,jolicloud/exponent,exponent/exponent,jolicloud/exponent,exponent/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent,jolicloud/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent