V4Only: In V4Only mode use PVer4 for all SafeBrowsing operations

components/safe_browsing_db/v4_feature_list.cc

 // Copyright 2016 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 "components/safe_browsing_db/v4_feature_list.h"
 
 namespace safe_browsing {
 
 namespace V4FeatureList {
 
 namespace {
 const base::Feature kLocalDatabaseManagerEnabled{
     "SafeBrowsingV4LocalDatabaseManagerEnabled",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kV4HybridEnabled{"SafeBrowsingV4HybridEnabled",
                                      base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kV4OnlyEnabled{"SafeBrowsingV4OnlyEnabled",
+                                   base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace
 
 bool IsLocalDatabaseManagerEnabled() {
   return base::FeatureList::IsEnabled(kLocalDatabaseManagerEnabled) ||
-         IsV4HybridEnabled();
+         IsV4HybridEnabled() || IsV4OnlyEnabled();
 }
 
 bool IsV4HybridEnabled() {
   return base::FeatureList::IsEnabled(kV4HybridEnabled);
 }
 
+bool IsV4OnlyEnabled() {
+  // TODO(vakh): Enable this only when all the lists can be synced from the
+  // server. See http://b/33182208
+  return base::FeatureList::IsEnabled(kV4OnlyEnabled);
+}
+
 }  // namespace V4FeatureList
 
 }  // namespace safe_browsing