Add a --no-zygote command line flag

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index f4b76cb585a315e0e2897aaefa525eccbb7670e9..da9bdb7297c4a33b14831d4463996ff060dffbca 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -207,6 +207,10 @@ namespace {
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 void SetupSandbox(const base::CommandLine& parsed_command_line) {
   TRACE_EVENT0("startup", "SetupSandbox");
+  if (parsed_command_line.HasSwitch(switches::kNoZygote)) {
+    DCHECK(parsed_command_line.HasSwitch(switches::kNoSandbox));
+    return;
+  }
 
   // Tickle the sandbox host and zygote host so they fork now.
   RenderSandboxHostLinux::GetInstance()->Init();