Create blobs from Disk Cache entries.

storage/browser/blob/blob_data_builder.cc

Index: storage/browser/blob/blob_data_builder.cc
diff --git a/storage/browser/blob/blob_data_builder.cc b/storage/browser/blob/blob_data_builder.cc
index 7c305a2f37719f258f6d1e7099e19a28ea0d9951..ea6ec9eaf9e193614b51d0892d418efa7ebdd2a6 100644
--- a/storage/browser/blob/blob_data_builder.cc
+++ b/storage/browser/blob/blob_data_builder.cc
@@ -60,4 +60,13 @@ void BlobDataBuilder::AppendFileSystemFile(
   items_.push_back(new BlobDataItem(element.Pass()));
 }
 
+void BlobDataBuilder::AppendDiskCacheEntry(
+    int index,
+    const scoped_refptr<DataHandle>& data_handle) {
+  scoped_ptr<DataElement> element(new DataElement());
+  element->SetToDiskCacheEntryRange(
+      0U, data_handle->disk_cache_entry()->GetDataSize(index));
+  items_.push_back(new BlobDataItem(element.Pass(), data_handle, index));
+}
+
 }  // namespace storage