[NaCl SDK] Expose Google Drive to nacl_io.

native_client_sdk/src/libraries/nacl_io/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 assert(is_nacl,
        "These targets must only be built using the untrusted NaCl toolchains.")
 
 config("nacl_io_config") {
   cflags = [ "-Wno-sign-compare" ]
 }
@@ skipping 13 matching lines @@
     "devfs/jspipe_node.cc",
     "devfs/tty_node.cc",
     "dir_node.cc",
     "event_emitter.cc",
     "event_listener.cc",
     "fifo_char.cc",
     "filesystem.cc",
     "fusefs/fuse_fs.cc",
     "fusefs/fuse_fs_factory.cc",
     "getdents_helper.cc",
+    "googledrivefs/googledrivefs.cc",
     "h_errno.c",
     "host_resolver.cc",
     "html5fs/html5_fs.cc",
     "html5fs/html5_fs_node.cc",
     "httpfs/http_fs.cc",
     "httpfs/http_fs_node.cc",
     "in6_addr.c",
     "jsfs/js_fs.cc",
     "jsfs/js_fs_node.cc",
     "kernel_handle.cc",
@@ skipping 103 matching lines @@
     "syscalls/umount.c",
     "syscalls/uname.c",
     "syscalls/utime.c",
   ]
 
   include_dirs = [ ".." ]
   configs += [ ":nacl_io_config" ]
 
   public_configs = [ ":nacl_io_include_dirs" ]
 }