Build PPAPI NaCl Glibc tests with GN

build/toolchain/gcc_toolchain.gni

 # Copyright (c) 2013 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.
 
+import("//build/config/nacl/config.gni")
 import("//build/toolchain/toolchain.gni")
 
 # This value will be inherited in the toolchain below.
 concurrent_links = exec_script("get_concurrent_links.py", [], "value")
 
 # This template defines a toolchain for something that works like gcc
 # (including clang).
 #
 # It requires the following variables specifying the executables to run:
 #  - cc
@@ skipping 285 matching lines @@
       # These values need to be passed through unchanged.
       target_os = target_os
       target_cpu = target_cpu
 
       if (defined(invoker.is_clang)) {
         is_clang = invoker.is_clang
       }
       if (defined(invoker.is_component_build)) {
         is_component_build = invoker.is_component_build
       }
+      if (defined(invoker.is_nacl_glibc)) {
+        is_nacl_glibc = invoker.is_nacl_glibc
+      }
     }
 
     if (defined(invoker.deps)) {
       deps = invoker.deps
     }
   }
 }