Adding a special toolchain that will work with chromeos.

chrome/nacl.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'nacl_target': 0,
     },
     'target_conditions': [
@@ skipping 86 matching lines @@
               'outputs': ['<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
                           '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe'],
               'action': [
                 '<@(irt_build_cmd)',
                 '--platform', 'x86-32',
                 '--platform', 'x86-64',
               ],
             },
           ],
         }],
-        ['OS!="win" and target_arch=="ia32" and chromeos==0', {
+        ['OS!="win" and target_arch=="ia32"', {
           # Linux-x86-32 and OSX need only the x86-32 IRT.
           'actions': [
             {
               'action_name': 'nacl_irt',
               'message': 'Building NaCl IRT',
               'inputs': [
                 '<!@(<(irt_inputs_cmd) --platform=x86-32)',
               ],
               'outputs': ['<(PRODUCT_DIR)/nacl_irt_x86_32.nexe'],
               'action': [
                 '<@(irt_build_cmd)', '--platform', 'x86-32',
               ],
             },
           ],
         }],
-        ['OS!="win" and target_arch=="x64" and chromeos==0', {
+        ['OS!="win" and target_arch=="x64"', {
           # Linux-x86-64 needs only the x86-64 IRT.
           'actions': [
             {
               'action_name': 'nacl_irt',
               'message': 'Building NaCl IRT',
               'inputs': [
                 '<!@(<(irt_inputs_cmd) --platform=x86-64)',
               ],
               'outputs': ['<(PRODUCT_DIR)/nacl_irt_x86_64.nexe'],
               'action': [
@@ skipping 96 matching lines @@
                         # reference nacl_helper as a shared library
                         '<(PRODUCT_DIR)/nacl_helper.so',
                         '-Wl,-rpath,<(SHARED_LIB_DIR)',
                       ],
           },
         },
       ],
     }],
   ],
 }