Have each SandboxedProcessLauncherDelegate maintain a zygote.

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',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 143 matching lines @@
       'public/common/url_fetcher.h',
       'public/common/url_utils.cc',
       'public/common/url_utils.h',
       'public/common/user_agent.h',
       'public/common/web_preferences.cc',
       'public/common/web_preferences.h',
       'public/common/webplugininfo.cc',
       'public/common/webplugininfo.h',
       'public/common/window_container_type.cc',
       'public/common/window_container_type.h',
+      'public/common/zygote_alias.h',
       'public/common/zygote_fork_delegate_linux.h',
     ],
     'private_common_sources': [
       'common/accessibility_messages.h',
       'common/all_messages.h',
       'common/android/address_parser.cc',
       'common/android/address_parser.h',
       'common/android/address_parser_internal.cc',
       'common/android/address_parser_internal.h',
       'common/android/common_jni_registrar.cc',
@@ skipping 939 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
   ],
 }