Add a death test to check field trial creation before FieldTrialList.

base/metrics/field_trial_unittest.cc

Index: base/metrics/field_trial_unittest.cc
diff --git a/base/metrics/field_trial_unittest.cc b/base/metrics/field_trial_unittest.cc
index 905cc22ea117b11b5c41faa3137231bfc8028dd2..80c729d86a2b36f74737518ec69238fc2a294bbb 100644
--- a/base/metrics/field_trial_unittest.cc
+++ b/base/metrics/field_trial_unittest.cc
@@ -990,4 +990,15 @@ TEST_F(FieldTrialTest, CreateSimulatedFieldTrial) {
   }
 }
 
+#if GTEST_HAS_DEATH_TEST
+TEST(FieldTrialDeathTest, OneTimeRandomizedTrialWithoutFieldTrialList) {
+  // Trying to instantiate a one-time randomized field trial before the
+  // FieldTrialList is created should crash.
+  EXPECT_DEATH(FieldTrialList::FactoryGetFieldTrial(
+      "OneTimeRandomizedTrialWithoutFieldTrialList", 100, kDefaultGroupName,
+      base::FieldTrialList::kNoExpirationYear, 1, 1,
+      base::FieldTrial::ONE_TIME_RANDOMIZED, NULL), "");
+}
+#endif
+
 }  // namespace base