GTTF: add independent test timeout for the test launcher

base/test/test_switches.cc

Index: base/test/test_switches.cc
diff --git a/base/test/test_switches.cc b/base/test/test_switches.cc
index b1c57f7700e2a63889b9d070d5864313fa0fbfc7..0c7a6f52e577b51b18eac62c3ccafa665bfc40ed 100644
--- a/base/test/test_switches.cc
+++ b/base/test/test_switches.cc
@@ -18,6 +18,7 @@ const char switches::kTestLauncherJobs[] = "test-launcher-jobs";
 const char switches::kTestLauncherOutput[] = "test-launcher-output";
 
 // Time (in milliseconds) that the tests should wait before timing out.
+const char switches::kTestLauncherTimeout[] = "test-launcher-timeout";
 // TODO(phajdan.jr): Clean up the switch names.
 const char switches::kTestTinyTimeout[] = "test-tiny-timeout";
 const char switches::kUiTestActionTimeout[] = "ui-test-action-timeout";