Create blobs from Disk Cache entries.

storage/common/data_element.cc

Index: storage/common/data_element.cc
diff --git a/storage/common/data_element.cc b/storage/common/data_element.cc
index c6d52f4dac646af95feb85a26ce35aa2c8075db3..1779fc8cda36ce6243b931b135528b6552bf64ec 100644
--- a/storage/common/data_element.cc
+++ b/storage/common/data_element.cc
@@ -46,4 +46,10 @@ void DataElement::SetToFileSystemUrlRange(
   expected_modification_time_ = expected_modification_time;
 }
 
+void DataElement::SetToDiskCacheEntryRange(uint64 offset, uint64 length) {
+  offset_ = offset;
+  length_ = length;
+  type_ = TYPE_DISK_CACHE_ENTRY;
+}
+
 }  // namespace storage