Add an initial Linux GPU sandbox using the seccomp filter framework.

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../gpu/gpu.gyp:gles2_implementation',
     '../gpu/gpu.gyp:gpu_ipc',
@@ skipping 267 matching lines @@
     'common/quota_dispatcher.cc',
     'common/quota_dispatcher.h',
     'common/request_extra_data.cc',
     'common/request_extra_data.h',
     'common/resource_dispatcher.cc',
     'common/resource_dispatcher.h',
     'common/resource_messages.h',
     'common/sandbox_init_mac.cc',
     'common/sandbox_init_mac.h',
     'common/sandbox_init_win.cc',
+    'common/sandbox_init_linux.cc',
     'common/sandbox_mac.h',
     'common/sandbox_mac.mm',
     'common/sandbox_methods_linux.h',
     'common/sandbox_policy.cc',
     'common/sandbox_policy.h',
     'common/set_process_title.cc',
     'common/set_process_title.h',
     'common/set_process_title_linux.cc',
     'common/set_process_title_linux.h',
     'common/socket_stream.h',
@@ skipping 141 matching lines @@
         '../build/extract_from_cab.py',
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
       },
      ]
     }]
   ],
 }