Allow using the namespace sandbox in zygote host.

content/public/common/content_switches.cc

 // 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.
 
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 570 matching lines @@
 // Mutes audio sent to the audio device so it is not audible during
 // automated testing.
 const char kMuteAudio[]                     = "mute-audio";
 
 // Don't send HTTP-Referer headers.
 const char kNoReferrers[]                   = "no-referrers";
 
 // Disables the sandbox for all process types that are normally sandboxed.
 const char kNoSandbox[]                     = "no-sandbox";
 
+// Prefer the namespace sandbox over the setuid sandbox when possible.
+const char kEnableNamespaceSandbox[]        = "enable-namespace-sandbox";
+
 // Number of worker threads used to rasterize content.
 const char kNumRasterThreads[]              = "num-raster-threads";
 
 // Controls the behavior of history navigation in response to horizontal
 // overscroll.
 // Set the value to '0' to disable.
 // Set the value to '1' to enable the behavior where pages slide in and out in
 // response to the horizontal overscroll gesture and a screenshot of the target
 // page is shown.
 // Set the value to '2' to enable the simplified overscroll UI where a
@@ skipping 354 matching lines @@
 const char kEnableNpapi[]                   = "enable-npapi";
 
 #if defined(ENABLE_PLUGINS)
 // Enables the plugin power saver feature.
 const char kEnablePluginPowerSaver[] = "enable-plugin-power-saver";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches