New blobstoragecontext for use in the main browser process, not plugged in yet.

webkit/blob/blob_data_handle.h

+// 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 WEBKIT_BLOB_BLOB_DATA_HANDLE_H_
+#define WEBKIT_BLOB_BLOB_DATA_HANDLE_H_
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/supports_user_data.h"
+#include "webkit/storage/webkit_storage_export.h"
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace webkit_blob {
+
+class BlobData;
+class BlobStorageContext;
+
+// A scoper object for use in chrome's main browser process, ensures
+// the underlying BlobData and its uuid remain in BlobStorageContext's
+// collection for the duration. This object has delete semantics and
+// maybe deleted on any thread.
+class WEBKIT_STORAGE_EXPORT BlobDataHandle
+    : public base::SupportsUserData::Data {
+ public:
+  virtual ~BlobDataHandle();  // Maybe be deleted on any thread.
+  BlobData* data() const;  // May only be accessed on the IO thread.
+
+ private:
+  friend class BlobStorageContext;
+  BlobDataHandle(BlobData* blob_data, BlobStorageContext* context,
+                 base::SequencedTaskRunner* task_runner);
+
+  static void DeleteHelper(
+      base::WeakPtr<BlobStorageContext> context,
+      BlobData* blob_data);
+
+  BlobData* blob_data_;  // Intentionally a raw ptr to a non-thread-safe ref.
+  base::WeakPtr<BlobStorageContext> context_;
+  scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
+};
+
+}  // namespace webkit_blob
+
+#endif  // WEBKIT_BLOB_BLOB_DATA_HANDLE_H_