DOMStorageContextImpl that's implemented in terms of the new dom_storage classes.

webkit/dom_storage/dom_storage_area.cc

 // 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.
 
 #include "webkit/dom_storage/dom_storage_area.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/time.h"
 #include "base/tracked_objects.h"
 #include "webkit/dom_storage/dom_storage_map.h"
 #include "webkit/dom_storage/dom_storage_namespace.h"
 #include "webkit/dom_storage/dom_storage_task_runner.h"
 #include "webkit/dom_storage/dom_storage_types.h"
 #include "webkit/fileapi/file_system_util.h"
 
 namespace dom_storage {
 
+// static
+const FilePath::CharType DomStorageArea::kDatabaseFileExtension[] =
+    FILE_PATH_LITERAL(".localstorage");
+
+// static
+FilePath DomStorageArea::DatabaseFileNameFromOrigin(const GURL& origin) {
+  std::string filename = fileapi::GetOriginIdentifierFromURL(origin);
+  // There is no FilePath.AppendExtension() method, so start with just the
+  // extension as the filename, and then InsertBeforeExtension the desired
+  // name.
+  return FilePath().Append(kDatabaseFileExtension).
+      InsertBeforeExtensionASCII(filename);
+}
+
 DomStorageArea::DomStorageArea(
     int64 namespace_id, const GURL& origin,
     const FilePath& directory, DomStorageTaskRunner* task_runner)
     : namespace_id_(namespace_id), origin_(origin),
       directory_(directory),
       task_runner_(task_runner),
       map_(new DomStorageMap(kPerAreaQuota)),
       backing_(NULL),
       initial_import_done_(false),
       clear_all_next_commit_(false),
@@ skipping 128 matching lines @@
 
 void DomStorageArea::CommitChanges() {
   DCHECK(backing_.get());
   if (backing_->CommitChanges(clear_all_next_commit_, changed_values_)) {
     clear_all_next_commit_ = false;
     changed_values_.clear();
   }
   commit_in_flight_ = false;
 }
 
-// static
-FilePath DomStorageArea::DatabaseFileNameFromOrigin(const GURL& origin) {
-  std::string filename = fileapi::GetOriginIdentifierFromURL(origin)
-      + ".localstorage";
-  return FilePath().AppendASCII(filename);
-}
-
 }  // namespace dom_storage