Build PPAPI NaCl Glibc tests with GN

build/toolchain/nacl/BUILD.gn

 # 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/sysroot.gni")
 import("//build/toolchain/nacl_toolchain.gni")
 
 nacl_toolchain_dir = rebase_path("//native_client/toolchain", root_build_dir)
 os_toolchain_dir = "${nacl_toolchain_dir}/${current_os}_x86"
 
@@ skipping 32 matching lines @@
   postlink = "$finalize $nonfinal_file -o $finalized_file"
   link_outputs = [ finalized_file ]
 }
 
 nacl_toolchain("glibc_x86") {
   toolchain_package = "nacl_x86_glibc"
   toolchain_revision = nacl_x86_glibc_rev
   toolchain_cpu = "x86"
   toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/i686-nacl-"
   is_clang = false
+  is_nacl_glibc = true
 
   cc = toolprefix + "gcc"
   cxx = toolprefix + "g++"
   ar = toolprefix + "ar"
   ld = cxx
 }
 
 nacl_toolchain("glibc_x64") {
   toolchain_package = "nacl_x86_glibc"
   toolchain_revision = nacl_x86_glibc_rev
   toolchain_cpu = "x64"
   toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/x86_64-nacl-"
   is_clang = false
+  is_nacl_glibc = true
 
   cc = toolprefix + "gcc"
   cxx = toolprefix + "g++"
   ar = toolprefix + "ar"
   ld = cxx
 }
 
 template("nacl_clang_toolchain") {
   toolchain_cpu = target_name
   assert(defined(invoker.toolchain_tuple), "Must define toolchain_tuple")
@@ skipping 62 matching lines @@
   toolchain_tuple = "i686-nacl"
 }
 
 nacl_clang_toolchains("x64") {
   toolchain_tuple = "x86_64-nacl"
 }
 
 nacl_clang_toolchains("arm") {
   toolchain_tuple = "arm-nacl"
 }