Allow using the namespace sandbox in zygote host.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index de9eb49d81d12b9b05e6131adccd58369f8c8261..6d1a2f37c52651050caece14d59c35d63732154b 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -588,6 +588,9 @@ 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";

[jln (very slow on Chromium), 2015/02/05 00:26:56]

This should be moved to respect alphabetical order.

[rickyz (no longer on Chrome), 2015/02/05 01:42:51]

Done.

+
 // Number of worker threads used to rasterize content.
 const char kNumRasterThreads[]              = "num-raster-threads";