Add a ScopedFeatureList class for testing and start using it.

base/test/test_suite.cc

Index: base/test/test_suite.cc
diff --git a/base/test/test_suite.cc b/base/test/test_suite.cc
index 512bde5810a349dc6cc2f8a3a39db86d8d28daf7..648132486381ff7f58cefd6841b88e88776e280f 100644
--- a/base/test/test_suite.cc
+++ b/base/test/test_suite.cc
@@ -311,6 +311,7 @@ void TestSuite::Initialize() {
   // ClearInstanceForTesting().
   created_feature_list_ =
       FeatureList::InitializeInstance(std::string(), std::string());
+  printf("initing the instance\n");

[Ilya Sherman, 2016/08/09 01:06:57]

Plz revert ;)

[Alexei Svitkine (slow), 2016/08/09 01:26:16]

Done.

 
 #if defined(OS_IOS)
   InitIOSTestMessageLoop();