Make --gtest_list_tests work again for unit tests.

base/test/launcher/unit_test_launcher.cc

 // 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.
 
 #include "base/test/launcher/unit_test_launcher.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 482 matching lines @@
       fprintf(stdout,
               "Valgrind detected, switching to single process mode.\n"
               "Pass --test-launcher-debug-launcher to valgrind the launcher "
               "itself.\n");
       fflush(stdout);
       force_single_process = true;
     }
   }
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(kGTestHelpFlag) ||
+      CommandLine::ForCurrentProcess()->HasSwitch(kGTestListTestsFlag) ||
       CommandLine::ForCurrentProcess()->HasSwitch(kSingleProcessTestsFlag) ||
       force_single_process) {
     return run_test_suite.Run();
   }
 #endif
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(kHelpFlag)) {
     PrintUsage();
     return 0;
   }
@@ skipping 37 matching lines @@
       argc, argv, run_test_suite, SysInfo::NumberOfProcessors());
 }
 
 int LaunchUnitTestsSerially(int argc,
                             char** argv,
                             const RunTestSuiteCallback& run_test_suite) {
   return LaunchUnitTestsInternal(argc, argv, run_test_suite, 1);
 }
 
 }  // namespace base