Add a utility function to run a process as an arbitrary user...

base/process_util_unittest.cc

Index: base/process_util_unittest.cc
===================================================================
--- base/process_util_unittest.cc	(revision 37643)
+++ base/process_util_unittest.cc	(working copy)
@@ -188,6 +188,15 @@
   ASSERT_TRUE(base::GetAppOutput(other_cmd_line, &output));
   EXPECT_EQ("", output);
 }
+
+TEST_F(ProcessUtilTest, LaunchAsUser) {
+  base::UserTokenHandle token;
+  ASSERT_TRUE(OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &token));
+  std::wstring cmdline =
+      this->MakeCmdLine(L"SimpleChildProcess", false).command_line_string();
+  EXPECT_TRUE(base::LaunchAppAsUser(token, cmdline, false, NULL));
+}
+
 #endif  // defined(OS_WIN)
 
 #if defined(OS_POSIX)