Add the new version for the POSIX-specific version of LaunchProcess.

base/process/launch.h

 // Copyright 2013 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.
 
 // This file contains functions for launching subprocesses.
 
 #ifndef BASE_PROCESS_LAUNCH_H_
 #define BASE_PROCESS_LAUNCH_H_
 
 #include <string>
@@ skipping 171 matching lines @@
 // and thus some common operations like OpenProcess will fail. Currently the
 // only supported LaunchOptions are |start_hidden| and |wait|.
 BASE_EXPORT Process LaunchElevatedProcess(const CommandLine& cmdline,
                                           const LaunchOptions& options);
 
 #elif defined(OS_POSIX)
 // A POSIX-specific version of LaunchProcess that takes an argv array
 // instead of a CommandLine.  Useful for situations where you need to
 // control the command line arguments directly, but prefer the
 // CommandLine version if launching Chrome itself.
+BASE_EXPORT Process LaunchProcess(const std::vector<std::string>& argv,
+                                  const LaunchOptions& options);
+
+// Deprecated version.
+// TODO(rvargas) crbug.com/417532: Remove this after migrating all consumers.
 BASE_EXPORT bool LaunchProcess(const std::vector<std::string>& argv,
                                const LaunchOptions& options,
                                ProcessHandle* process_handle);
 
 // Close all file descriptors, except those which are a destination in the
 // given multimap. Only call this function in a child process where you know
 // that there aren't any other threads.
 BASE_EXPORT void CloseSuperfluousFds(const InjectiveMultimap& saved_map);
 #endif  // defined(OS_POSIX)
 
@@ skipping 61 matching lines @@
 void ReplaceBootstrapPort(const std::string& replacement_bootstrap_name);
 #endif  // defined(OS_MACOSX)
 
 // Creates a LaunchOptions object suitable for launching processes in a test
 // binary. This should not be called in production/released code.
 BASE_EXPORT LaunchOptions LaunchOptionsForTest();
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_LAUNCH_H_