Add a --no-zygote command line flag

content/browser/browser_main_loop.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/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 189 matching lines @@
 #ifdef DestroyAll
 #undef DestroyAll
 #endif
 
 namespace content {
 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));

[rickyz (no longer on Chrome), 2016/10/04 20:00:32]

Let's upgrade this to a CHECK with an error message.

[Sami, 2016/10/05 13:15:16]

Done.

+    return;
+  }
 
   // Tickle the sandbox host and zygote host so they fork now.
   RenderSandboxHostLinux::GetInstance()->Init();
   ZygoteHostImpl::GetInstance()->Init(parsed_command_line);
   *GetGenericZygote() = CreateZygote();
   RenderProcessHostImpl::EarlyZygoteLaunch();
 }
 #endif
 
 #if defined(USE_GLIB)
@@ skipping 1344 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner =
         audio_thread_->task_runner();
     audio_manager_ = media::AudioManager::Create(std::move(audio_task_runner),
                                                  std::move(worker_task_runner),
                                                  MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content