POSIX: don't spawn zombies.

chrome/test/ui/ui_test.cc

 // Copyright (c) 2006-2008 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 "chrome/test/ui/ui_test.h"
 
 #include <set>
 #include <vector>
 
 #include "base/base_switches.h"
@@ skipping 274 matching lines @@
     command_line.AppendSwitch(switches::kSafePlugins);
   if (enable_dcheck_)
     command_line.AppendSwitch(switches::kEnableDCHECK);
   if (silent_dump_on_dcheck_)
     command_line.AppendSwitch(switches::kSilentDumpOnDCHECK);
   if (disable_breakpad_)
     command_line.AppendSwitch(switches::kDisableBreakpad);
   if (!homepage_.empty())
     command_line.AppendSwitchWithValue(switches::kHomePage,
                                        homepage_);
-  PathService::Get(chrome::DIR_USER_DATA, &user_data_dir_);
+#if defined(OS_POSIX)
+  const char* alternative_userdir = getenv("CHROME_UI_TESTS_USER_DATA_DIR");
+#else
+  const FilePath::StringType::value_type* const alternative_userdir = NULL;
+#endif
+
+  if (alternative_userdir) {
+    user_data_dir_ = FilePath(alternative_userdir);
+  } else {
+    PathService::Get(chrome::DIR_USER_DATA, &user_data_dir_);
+  }
+
   if (!user_data_dir_.empty())
     command_line.AppendSwitchWithValue(switches::kUserDataDir,
                                        user_data_dir_.ToWStringHack());
   if (!js_flags_.empty())
     command_line.AppendSwitchWithValue(switches::kJavaScriptFlags,
                                        js_flags_);
   if (!log_level_.empty())
     command_line.AppendSwitchWithValue(switches::kLoggingLevel, log_level_);
 
   command_line.AppendSwitch(switches::kMetricsRecordingOnly);
@@ skipping 556 matching lines @@
 }
 
 bool UITest::EvictFileFromSystemCacheWrapper(const FilePath& path) {
   for (int i = 0; i < 10; i++) {
     if (file_util::EvictFileFromSystemCache(path))
       return true;
     PlatformThread::Sleep(1000);
   }
   return false;
 }