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..94fb9e50388633ba5bfcff901338603efc5039b6 100644
--- a/storage/browser/blob/blob_data_builder.cc
+++ b/storage/browser/blob/blob_data_builder.cc
@@ -5,6 +5,7 @@
 #include "storage/browser/blob/blob_data_builder.h"
 
 #include "base/time/time.h"
+#include "net/disk_cache/disk_cache.h"
 #include "storage/browser/blob/shareable_file_reference.h"
 
 namespace storage {
@@ -60,4 +61,16 @@ void BlobDataBuilder::AppendFileSystemFile(
   items_.push_back(new BlobDataItem(element.Pass()));
 }
 
+void BlobDataBuilder::AppendDiskCacheEntry(
+    const scoped_refptr<DataHandle>& data_handle,
+    disk_cache::Entry* disk_cache_entry,
+    int disk_cache_stream_index) {
+  scoped_ptr<DataElement> element(new DataElement());
+  element->SetToDiskCacheEntryRange(
+      0U, disk_cache_entry->GetDataSize(disk_cache_stream_index));
+  items_.push_back(
+      new BlobDataItem(element.Pass(), data_handle, disk_cache_entry,
+                       disk_cache_stream_index));
+}
+
 }  // namespace storage