Add a --no-zygote command line flag

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 2db58beaa2b0a0425b04a8a3192922f2379d6862..50e8dca01dc61ac4a976dbd2841fbe65cb179cdc 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -666,6 +666,12 @@ const char kNoReferrers[]                   = "no-referrers";
 // Disables the sandbox for all process types that are normally sandboxed.
 const char kNoSandbox[]                     = "no-sandbox";
 
+// Disables the use of a zygote process for forking child processes. Instead,
+// child processes will be forked and exec'd directly. Note that --no-sandbox
+// should also be used together with this flag because the sandbox needs the
+// zygote to work.
+const char kNoZygote[] = "no-zygote";
+
 // Enable or disable appcontainer/lowbox for renderer on Win8+ platforms.
 const char kEnableAppContainer[]           = "enable-appcontainer";
 const char kDisableAppContainer[]          = "disable-appcontainer";