Returns true if the intent contains the given extra

Property definitions

android $ Intent :: has_extra
	# Returns `true` if the intent contains the given extra
	fun has_extra(extra: String): Bool
	do
		sys.jni_env.push_local_frame(1)
		var return_value = intent.has_extra(extra.to_java_string)
		sys.jni_env.pop_local_frame
		return return_value
	end
lib/android/intent/intent_api10.nit:748,2--755,4