Switch LevelDBWrapper::GetAll to use the new Mojo sync IPC mechanism.

content/renderer/dom_storage/local_storage_cached_areas.h

+// 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.
+
+#ifndef CONTENT_RENDERER_DOM_STORAGE_LOCAL_STORAGE_CACHED_AREAS_H_
+#define CONTENT_RENDERER_DOM_STORAGE_LOCAL_STORAGE_CACHED_AREAS_H_
+
+#include <map>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "url/origin.h"
+
+namespace content {
+class LocalStorageCachedArea;
+class StoragePartitionService;
+
+// Owns all the LocalStorageCachedArea objects in a renderer. This is needed
+// because we can have n LocalStorageArea objects for the same origin but we
+// want just one LocalStorageCachedArea to service them (no point in having
+// multiple caches of the same data in the same process).
+class LocalStorageCachedAreas {
+ public:
+  explicit LocalStorageCachedAreas(
+      StoragePartitionService* storage_partition_service);
+  ~LocalStorageCachedAreas();
+
+  scoped_refptr<LocalStorageCachedArea> GetLocalStorageCachedArea(

[michaeln, 2016/03/01 01:38:48]

naming nit: method names might be shorter are more clear

GetOrCreateCachedArea()
CachedAreaDestructed()

+      const url::Origin& origin);
+
+  // Called by LocalStorageCachedArea on destruction.
+  void LocalStorageCacheAreaClosed(LocalStorageCachedArea* cached_area);
+
+ private:
+  StoragePartitionService* const storage_partition_service_;
+
+  // Maps from an origin to its LocalStorageCachedArea object. The object owns
+  // itself.
+  std::map<url::Origin, LocalStorageCachedArea*> cached_areas_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageCachedAreas);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_DOM_STORAGE_LOCAL_STORAGE_CACHED_AREAS_H_