Support partitioning of storage contexts based on render_id.

content/browser/storage_partition_map.h

+// 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.
+
+#ifndef CONTENT_BROWSER_STORAGE_PARTITION_MAP_H_
+#define CONTENT_BROWSER_STORAGE_PARTITION_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/callback_forward.h"
+#include "base/supports_user_data.h"
+
+class FilePath;
+
+namespace content {
+
+class BrowserContext;
+class StoragePartition;
+
+// A std::string to StoragePartition map for use with SupportsUserData APIs.
+class StoragePartitionMap : public base::SupportsUserData::Data {
+ public:
+  explicit StoragePartitionMap(BrowserContext* browser_context);
+
+  virtual ~StoragePartitionMap();
+
+  // This map retains ownership of the returned StoragePartition objects.
+  StoragePartition* Get(const std::string& partition_id);
+
+  void ForEach(const base::Callback<void(StoragePartition*)>& callback);
+
+ private:
+  // This must always be called *after* |partition| has been added to the
+  // partitions_.
+  //
+  // TODO(ajwong): Is there a way to make it so that Get()'s implementation
+  // doesn't need to be aware of this ordering?  Revisit when refactoring
+  // ResourceContext and AppCache to respect storage partitions.
+  void PostCreateInitialization(StoragePartition* partition,
+                                const FilePath& partition_path);
+
+  BrowserContext* browser_context_;  // Not Owned.
+  std::map<std::string, StoragePartition*> partitions_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_STORAGE_PARTITION_MAP_H_