Add macro definition __CHROMEOS__ for ChromeOS builds in GYP.

breakpad/breakpad.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'breakpad_sender.gypi',
     'breakpad_handler.gypi',
   ],
   'conditions': [
@@ skipping 558 matching lines @@
             'src/common/string_conversion.cc',
             'src/common/string_conversion.h',
           ],
 
           'conditions': [
             ['target_arch=="arm" and chromeos==1', {
               # Avoid running out of registers in
               # linux_syscall_support.h:sys_clone()'s inline assembly.
               'cflags': ['-marm'],
             }],
+            ['chromeos==1', {
+              'defines': ['__CHROMEOS__'],
+            }],
             ['OS=="android"', {
               'include_dirs': [
                 'src/common/android/include',
               ],
               'direct_dependent_settings': {
                 'include_dirs': [
                   'src/common/android/include',
                 ],
               },
               'sources': [
@@ skipping 353 matching lines @@
                   'breakpad_unittests_apk.isolate',
                 ],
               },
             ]
           }
         ],
       ],
     }],
   ],
 }