Create blobs from Disk Cache entries.

net/base/upload_element_reader.h

Index: net/base/upload_element_reader.h
diff --git a/net/base/upload_element_reader.h b/net/base/upload_element_reader.h
index 2814efa33f126f62845ff2790a76fa8b5d9438e1..cc20277a0da64a1b2267619ace6244dc892d1aec 100644
--- a/net/base/upload_element_reader.h
+++ b/net/base/upload_element_reader.h
@@ -13,6 +13,7 @@ namespace net {
 
 class IOBuffer;
 class UploadBytesElementReader;
+class UploadDiskCacheEntryElementReader;
 class UploadFileElementReader;
 
 // An interface to read an upload data element.
@@ -25,6 +26,11 @@ class NET_EXPORT UploadElementReader {
   // otherwise returns NULL.
   virtual const UploadBytesElementReader* AsBytesReader() const;
 
+  // Returns this instance's pointer as UploadDiskCacheEntryElementReader when
+  // possible, otherwise returns NULL.
+  virtual const UploadDiskCacheEntryElementReader* AsDiskCacheEntryReader()
+      const;
+
   // Returns this instance's pointer as UploadFileElementReader when possible,
   // otherwise returns NULL.
   virtual const UploadFileElementReader* AsFileReader() const;