Register a default instance of FeatureList for content browser.

base/feature_list.cc

 // Copyright 2015 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/feature_list.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 77 matching lines @@
   return GetInstance()->IsFeatureEnabled(feature);
 }
 
 // static
 std::vector<std::string> FeatureList::SplitFeatureListString(
     const std::string& input) {
   return SplitString(input, ",", TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
 }
 
 // static
+void FeatureList::InitializeInstance() {
+  if (g_instance)
+    return;
+  SetInstance(make_scoped_ptr(new FeatureList));
+}
+
+// static
 FeatureList* FeatureList::GetInstance() {
   return g_instance;
 }
 
 // static
 void FeatureList::SetInstance(scoped_ptr<FeatureList> instance) {
   DCHECK(!g_instance);
   instance->FinalizeInitialization();
 
   // Note: Intentional leak of global singleton.
@@ skipping 54 matching lines @@
   return it->second == &feature;
 }
 
 FeatureList::OverrideEntry::OverrideEntry(OverrideState overridden_state,
                                           FieldTrial* field_trial)
     : overridden_state(overridden_state),
       field_trial(field_trial),
       overridden_by_field_trial(field_trial != nullptr) {}
 
 }  // namespace base