[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/tests/nacl_io_test/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl'],
   'SEL_LDR': True,
 
   'TARGETS': [
     {
       'NAME' : 'nacl_io_test',
       'TYPE' : 'main',
       'SOURCES' : [
         'event_test.cc',
         'fake_core_interface.cc',
         'fake_core_interface.h',
         'fake_pepper_interface_html5fs.cc',
         'fake_pepper_interface_html5fs.h',
         'fake_resource_manager.cc',
         'fake_resource_manager.h',
         'fake_var_interface.cc',
         'fake_var_interface.h',
+        'fifo_test.cc',
         'kernel_object_test.cc',
         'kernel_proxy_mock.cc',
         'kernel_proxy_mock.h',
         'kernel_proxy_test.cc',
         'kernel_wrap_test.cc',
         'main.cc',
         'mock_util.h',
         'mount_dev_mock.h',
         'mount_html5fs_test.cc',
         'mount_http_test.cc',
@@ skipping 19 matching lines @@
       'CFLAGS_GCC': ['-Wno-unused-local-typedefs'],
     }
   ],
   'DATA': [
     'example.js'
   ],
   'DEST': 'tests',
   'NAME': 'nacl_io_test',
   'TITLE': 'NaCl IO test',
 }