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 339 matching lines @@
 // Dynamically apply color profiles to web content images.
 const char kEnableImageColorProfiles[]      = "enable-image-color-profiles";
 
 // Force logging to be enabled.  Logging is disabled by default in release
 // builds.
 const char kEnableLogging[]                 = "enable-logging";
 
 // Enables the memory benchmarking extension
 const char kEnableMemoryBenchmarking[]      = "enable-memory-benchmarking";
 
+// Prefer the namespace sandbox over the setuid sandbox when possible.
+const char kEnableNamespaceSandbox[]        = "enable-namespace-sandbox";
+
 // Enables the network information API.
 const char kEnableNetworkInformation[]      = "enable-network-information";
 
 // Enable rasterizer that writes directly to GPU memory.
 const char kEnableOneCopy[]                 = "enable-one-copy";
 
 // Enables use of hardware overlay for fullscreen video playback. Android only.
 const char kEnableOverlayFullscreenVideo[]  = "enable-overlay-fullscreen-video";
 
 // Enables compositor-accelerated touch-screen pinch gestures.
@@ skipping 597 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