Implement CurrentProcessInfo::CreationTime() for Linux.

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 397 matching lines @@
           'process/memory_mac.mm',
           'process/memory_win.cc',
           'process/process.h',
           'process/process_handle_freebsd.cc',
           'process/process_handle_linux.cc',
           'process/process_handle_mac.cc',
           'process/process_handle_openbsd.cc',
           'process/process_handle_posix.cc',
           'process/process_handle_win.cc',
           'process/process_info.h',
+          'process/process_info_linux.cc',
           'process/process_info_mac.cc',
           'process/process_info_win.cc',
           'process/process_iterator.cc',
           'process/process_iterator.h',
           'process/process_iterator_freebsd.cc',
           'process/process_iterator_linux.cc',
           'process/process_iterator_mac.cc',
           'process/process_iterator_openbsd.cc',
           'process/process_iterator_win.cc',
           'process/process_linux.cc',
@@ skipping 456 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }