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diff --git a/content/browser/indexed_db/indexed_db_database.h b/content/browser/indexed_db/indexed_db_database.h
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+++ b/content/browser/indexed_db/indexed_db_database.h
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+// Copyright (c) 2013 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_INDEXED_DB_INDEXED_DB_DATABASE_H_
+#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string16.h"
+#include "content/browser/indexed_db/indexed_db.h"
+#include "content/browser/indexed_db/indexed_db_database_error.h"
+#include "content/common/indexed_db/indexed_db_key.h"
+#include "content/common/indexed_db/indexed_db_key_path.h"
+#include "content/common/indexed_db/indexed_db_key_range.h"
+
+namespace content {
+
+class IndexedDBCallbacksWrapper;
+class IndexedDBDatabaseCallbacksWrapper;
+struct IndexedDBDatabaseMetadata;
+
+// This is implemented by IndexedDBDatabaseImpl and optionally others (in order
+// to proxy calls across process barriers). All calls to these classes should be
+// non-blocking and trigger work on a background thread if necessary.
+class IndexedDBDatabase : public base::RefCounted<IndexedDBDatabase> {
+ public:
+  virtual void CreateObjectStore(int64 transaction_id,
+                                 int64 object_store_id,
+                                 const string16& name,
+                                 const IndexedDBKeyPath& key_path,
+                                 bool auto_increment) = 0;
+  virtual void DeleteObjectStore(int64 transaction_id,
+                                 int64 object_store_id) = 0;
+  virtual void CreateTransaction(
+      int64 transaction_id,
+      scoped_refptr<IndexedDBDatabaseCallbacksWrapper> callbacks,
+      const std::vector<int64>& object_store_ids,
+      uint16 mode) = 0;
+  virtual void Close(
+      scoped_refptr<IndexedDBDatabaseCallbacksWrapper> callbacks) = 0;
+
+  // Transaction-specific operations.
+  virtual void Commit(int64 transaction_id) = 0;
+  virtual void Abort(int64 transaction_id) = 0;
+  virtual void Abort(int64 transaction_id,
+                     scoped_refptr<IndexedDBDatabaseError> error) = 0;
+
+  virtual void CreateIndex(int64 transaction_id,
+                           int64 object_store_id,
+                           int64 index_id,
+                           const string16& name,
+                           const IndexedDBKeyPath& key_path,
+                           bool unique,
+                           bool multi_entry) = 0;
+  virtual void DeleteIndex(int64 transaction_id,
+                           int64 object_store_id,
+                           int64 index_id) = 0;
+
+  enum TaskType {
+    NORMAL_TASK = 0,
+    PREEMPTIVE_TASK
+  };
+
+  enum PutMode {
+    ADD_OR_UPDATE,
+    ADD_ONLY,
+    CURSOR_UPDATE
+  };
+
+  static const int64 kMinimumIndexId = 30;
+
+  typedef std::vector<IndexedDBKey> IndexKeys;
+
+  virtual void Get(int64 transaction_id,
+                   int64 object_store_id,
+                   int64 index_id,
+                   scoped_ptr<IndexedDBKeyRange> key_range,
+                   bool key_only,
+                   scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
+  // This will swap() with value.
+  virtual void Put(int64 transaction_id,
+                   int64 object_store_id,
+                   std::vector<char>* value,
+                   scoped_ptr<IndexedDBKey> key,
+                   PutMode mode,
+                   scoped_refptr<IndexedDBCallbacksWrapper> callbacks,
+                   const std::vector<int64>& index_ids,
+                   const std::vector<IndexKeys>& index_keys) = 0;
+  virtual void SetIndexKeys(int64 transaction_id,
+                            int64 object_store_id,
+                            scoped_ptr<IndexedDBKey> primary_key,
+                            const std::vector<int64>& index_ids,
+                            const std::vector<IndexKeys>& index_keys) = 0;
+  virtual void SetIndexesReady(int64 transaction_id,
+                               int64 object_store_id,
+                               const std::vector<int64>& index_ids) = 0;
+  virtual void OpenCursor(
+      int64 transaction_id,
+      int64 object_store_id,
+      int64 index_id,
+      scoped_ptr<IndexedDBKeyRange> key_Range,
+      indexed_db::CursorDirection direction,
+      bool key_only,
+      TaskType task_type,
+      scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
+  virtual void Count(int64 transaction_id,
+                     int64 object_store_id,
+                     int64 index_id,
+                     scoped_ptr<IndexedDBKeyRange> key_range,
+                     scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
+  virtual void DeleteRange(
+      int64 transaction_id,
+      int64 object_store_id,
+      scoped_ptr<IndexedDBKeyRange> key_range,
+      scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
+  virtual void Clear(int64 transaction_id,
+                     int64 object_store_id,
+                     scoped_refptr<IndexedDBCallbacksWrapper> callbacks) = 0;
+
+ protected:
+  virtual ~IndexedDBDatabase() {}
+  friend class base::RefCounted<IndexedDBDatabase>;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_