[BlobAsync] Disk support for blob storage

storage/browser/blob/blob_flattener.h

+// TODO: Insert description here. (generated by dmurph)
+
+#ifndef STORAGE_BROWSER_BLOB_BLOB_FLATTENER_H_
+#define STORAGE_BROWSER_BLOB_BLOB_FLATTENER_H_
+
+#include "base/macros.h"
+
+#include <map>
+#include <string>
+
+#include "storage/browser/blob/blob_slice.h"
+#include "storage/browser/blob/blob_storage_registry.h"
+
+namespace storage {
+class BlobDataBuilder;
+class InternalBlobData;
+
+// This takes blob slices
+class BlobFlattener {
+ public:
+  static void FlattenBlob(
+      const std::string& uuid,
+      InternalBlobData* output_blob,
+      std::vector<BlobStorageRegistry::ItemCopyEntry>* copies_from_built_ref,
+      std::vector<BlobStorageRegistry::ItemCopyEntry>* copies_from_pending_ref,
+      std::map<std::string, BlobSlice> slice_map,
+      const BlobDataBuilder& transportation_result);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BlobFlattener);
+};
+
+}  // namespace storage
+#endif  // STORAGE_BROWSER_BLOB_BLOB_FLATTENER_H_