Add the ability to change directories before execing.

base/test/multiprocess_test.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 "base/test/multiprocess_test.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 
 namespace base {
 
 #if !defined(OS_ANDROID)
 Process SpawnMultiProcessTestChild(
     const std::string& procname,
     const CommandLine& base_command_line,
     const LaunchOptions& options) {
   CommandLine command_line(base_command_line);
   // TODO(viettrungluu): See comment above |MakeCmdLine()| in the header file.
   // This is a temporary hack, since |MakeCmdLine()| has to provide a full
   // command line.
   if (!command_line.HasSwitch(switches::kTestChildProcess))
     command_line.AppendSwitchASCII(switches::kTestChildProcess, procname);
 
   return LaunchProcess(command_line, options);
 }
 #endif  // !defined(OS_ANDROID)
 
 CommandLine GetMultiProcessTestChildBaseCommandLine() {
-  return *CommandLine::ForCurrentProcess();
+  CommandLine cmd_line = *CommandLine::ForCurrentProcess();
+  cmd_line.SetProgram(MakeAbsoluteFilePath(cmd_line.GetProgram()));
+  return cmd_line;
 }
 
 // MultiProcessTest ------------------------------------------------------------
 
 MultiProcessTest::MultiProcessTest() {
 }
 
 Process MultiProcessTest::SpawnChild(const std::string& procname) {
   LaunchOptions options;
 #if defined(OS_WIN)
   options.start_hidden = true;
 #endif
   return SpawnChildWithOptions(procname, options);
 }
 
 Process MultiProcessTest::SpawnChildWithOptions(
     const std::string& procname,
     const LaunchOptions& options) {
   return SpawnMultiProcessTestChild(procname, MakeCmdLine(procname), options);
 }
 
 CommandLine MultiProcessTest::MakeCmdLine(const std::string& procname) {
   CommandLine command_line = GetMultiProcessTestChildBaseCommandLine();
   command_line.AppendSwitchASCII(switches::kTestChildProcess, procname);
   return command_line;
 }
 
 }  // namespace base