Add minimum version to extension management

chrome/browser/extensions/extension_management_constants.cc

 // Copyright 2014 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 "chrome/browser/extensions/extension_management_constants.h"
 
 #include "base/macros.h"
 
 namespace extensions {
 namespace schema_constants {
 
 const char kWildcard[] = "*";
 
 const char kInstallationMode[] = "installation_mode";
 const char kAllowed[] = "allowed";
 const char kBlocked[] = "blocked";
 const char kForceInstalled[] = "force_installed";
 const char kNormalInstalled[] = "normal_installed";
 
 const char kBlockedPermissions[] = "blocked_permissions";
 const char kAllowedPermissions[] = "allowed_permissions";
 
 const char kUpdateUrl[] = "update_url";
 const char kInstallSources[] = "install_sources";
 const char kAllowedTypes[] = "allowed_types";
 
+const char kMinimumVersion[] = "minimum_version";
+
 const char kUpdateUrlPrefix[] = "update_url:";
 
 const AllowedTypesMapEntry kAllowedTypesMap[] = {
   { "extension",           Manifest::TYPE_EXTENSION },
   { "theme",               Manifest::TYPE_THEME },
   { "user_script",         Manifest::TYPE_USER_SCRIPT },
   { "hosted_app",          Manifest::TYPE_HOSTED_APP },
   { "legacy_packaged_app", Manifest::TYPE_LEGACY_PACKAGED_APP },
   { "platform_app",        Manifest::TYPE_PLATFORM_APP },
   // TODO(binjin): Add shared_module type here and update ExtensionAllowedTypes
   // policy.
 };
 
 const size_t kAllowedTypesMapSize = arraysize(kAllowedTypesMap);
 
 Manifest::Type GetManifestType(const std::string& name) {
   for (size_t index = 0; index < kAllowedTypesMapSize; ++index) {
     if (kAllowedTypesMap[index].name == name)
       return kAllowedTypesMap[index].manifest_type;
   }
   return Manifest::TYPE_UNKNOWN;
 }
 
 }  // namespace schema_constants
 }  // namespace extensions