Persist sessionStorage on disk.

webkit/dom_storage/webkit_dom_storage.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'dom_storage',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/sql/sql.gyp:sql',
         '<(DEPTH)/third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
         '<(DEPTH)/third_party/sqlite/sqlite.gyp:sqlite',
         '<(DEPTH)/webkit/support/webkit_support.gyp:quota',
       ],
       'sources': [
         'dom_storage_area.cc',
         'dom_storage_area.h',
         'dom_storage_cached_area.cc',
         'dom_storage_cached_area.h',
         'dom_storage_context.cc',
         'dom_storage_context.h',
         'dom_storage_database.cc',
         'dom_storage_database.h',
+        'dom_storage_database_adapter.cc',
+        'dom_storage_database_adapter.h',
         'dom_storage_host.cc',
         'dom_storage_host.h',
         'dom_storage_map.cc',
         'dom_storage_map.h',
         'dom_storage_namespace.cc',
         'dom_storage_namespace.h',
         'dom_storage_proxy.h',
         'dom_storage_session.cc',
         'dom_storage_session.h',
         'dom_storage_task_runner.cc',
         'dom_storage_task_runner.h',
         'dom_storage_types.h',
+        'local_storage_database_adapter.cc',
+        'local_storage_database_adapter.h',
         'session_storage_database.cc',
-        'session_storage_database.h'
+        'session_storage_database.h',
+        'session_storage_database_adapter.cc',
+        'session_storage_database_adapter.h',
       ],
       'conditions': [
         ['inside_chromium_build==0', {
           'dependencies': [
             '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
           ],
         }],
       ],
     },
   ],
 }