Build PPAPI NaCl Glibc tests with GN

build/toolchain/nacl_toolchain.gni

 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/nacl/config.gni")
 import("//build/toolchain/gcc_toolchain.gni")
 
 # This template defines a NaCl toolchain.
 #
 # It requires the following variables specifying the executables to run:
 #  - cc
 #  - cxx
 #  - ar
 #  - ld
 # and the following which is used in the toolchain_args
@@ skipping 26 matching lines @@
   if (defined(invoker.postlink)) {
     postlink = invoker.postlink
   }
   if (defined(invoker.link_outputs)) {
     link_outputs = invoker.link_outputs
   }
 
   # We do not wish to suport shared builds with the NaCl toolchains.
   is_component_build = false
 
+  is_nacl_glibc = invoker.is_nacl_glibc
+
   gcc_toolchain(target_name) {
     rebuild_define = "NACL_TC_REV=" + invoker.toolchain_revision
     if (defined(invoker.deps)) {
       deps = invoker.deps
     }
   }
 }