Use a single, generic, global zygote to temporarily resolve perf regressions.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 391 matching lines @@
 
 #elif defined(OS_POSIX)
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
   ZygoteHandle* GetZygote() override {
     const base::CommandLine& browser_command_line =
         *base::CommandLine::ForCurrentProcess();
     base::CommandLine::StringType renderer_prefix =
         browser_command_line.GetSwitchValueNative(switches::kRendererCmdPrefix);
     if (!renderer_prefix.empty())
       return nullptr;
-    return &g_render_zygote;
+    return GetGenericZygote();
   }
 #endif  // !defined(OS_MACOSX) && !defined(OS_ANDROID)
   base::ScopedFD TakeIpcFd() override { return std::move(ipc_fd_); }
 #endif  // OS_WIN
 
   SandboxType GetSandboxType() override { return SANDBOX_TYPE_RENDERER; }
 
  private:
 #if defined(OS_POSIX)
   base::ScopedFD ipc_fd_;
@@ skipping 115 matching lines @@
 
 // static
 void RenderProcessHost::SetMaxRendererProcessCount(size_t count) {
   g_max_renderer_count_override = count;
 }
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
 // static
 void RenderProcessHostImpl::EarlyZygoteLaunch() {
   DCHECK(!g_render_zygote);
-  g_render_zygote = CreateZygote();
   // TODO(kerrnel): Investigate doing this without the ZygoteHostImpl as a
   // proxy. It is currently done this way due to concerns about race
   // conditions.
   ZygoteHostImpl::GetInstance()->SetRendererSandboxStatus(
-      g_render_zygote->GetSandboxStatus());
+      (*GetGenericZygote())->GetSandboxStatus());
 }
 #endif  // defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
 
 RenderProcessHostImpl::RenderProcessHostImpl(
     BrowserContext* browser_context,
     StoragePartitionImpl* storage_partition_impl,
     bool is_for_guests_only)
     : fast_shutdown_started_(false),
       deleting_soon_(false),
 #ifndef NDEBUG
@@ skipping 2224 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content