Adding method to create process using LowBox token in sandbox code.

content/browser/renderer_host/render_process_host_impl.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.
 
 // 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 306 matching lines @@
       : ipc_fd_(channel->TakeClientFileDescriptor())
 #endif  // OS_POSIX
   {}
 
   ~RendererSandboxedProcessLauncherDelegate() override {}
 
 #if defined(OS_WIN)
   virtual void PreSpawnTarget(sandbox::TargetPolicy* policy,
                               bool* success) {
     AddBaseHandleClosePolicy(policy);
+
+    AddAppContainerPolicy(policy);
+
     GetContentClient()->browser()->PreSpawnRenderer(policy, success);
   }
 
 #elif defined(OS_POSIX)
   bool ShouldUseZygote() override {
     const base::CommandLine& browser_command_line =
         *base::CommandLine::ForCurrentProcess();
     base::CommandLine::StringType renderer_prefix =
         browser_command_line.GetSwitchValueNative(switches::kRendererCmdPrefix);
     return renderer_prefix.empty();
@@ skipping 2025 matching lines @@
 
 void RenderProcessHostImpl::DecrementWorkerRefCount() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK_GT(worker_ref_count_, 0);
   --worker_ref_count_;
   if (worker_ref_count_ == 0)
     Cleanup();
 }
 
 }  // namespace content