Refactor the bootstrap sandbox process launching integration.

sandbox/mac/pre_exec_delegate.h

+// Copyright 2015 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.
+
+#ifndef SANDBOX_MAC_PRE_EXEC_DELEGATE_H_
+#define SANDBOX_MAC_PRE_EXEC_DELEGATE_H_
+
+#include "base/process/launch.h"
+
+namespace sandbox {
+
+// This PreExecDelegate will communicate with the BootstrapSandbox running
+// the Mach server registered under |sandbox_server_bootstrap_name|. It will
+// check in with th BootstrapSandbox using the |sandbox_token| and will
+// replace the task's bootstrap port with one provided by the sandbox.
+class PreExecDelegate : public base::LaunchOptions::PreExecDelegate {
+ public:
+  PreExecDelegate(const std::string& sandbox_server_bootstrap_name,
+                  uint64_t sandbox_token);
+  ~PreExecDelegate() override;
+
+  void RunAsyncSafe() override;
+
+ private:
+  const std::string sandbox_server_bootstrap_name_;
+  const char* const sandbox_server_bootstrap_name_ptr_;
+  const uint64_t sandbox_token_;
+
+  DISALLOW_COPY_AND_ASSIGN(PreExecDelegate);
+};
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_MAC_PRE_EXEC_DELEGATE_H_