[fsp] Add support for providing thumbnails.

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h

Index: chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h
index 909bb8a846da5d8e767d5bf3eeb163c7e2536258..046336a6c9c32eb1253130cada408c701cef61c5 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h
@@ -8,6 +8,7 @@
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "webkit/browser/blob/file_stream_reader.h"
 #include "webkit/browser/fileapi/file_system_url.h"
@@ -69,7 +70,7 @@ class FileStreamReader : public storage::FileStreamReader {
   // Called when initialization is completed with either a success or an error.
   void OnInitializeCompleted(const base::Closure& pending_closure,
                              const net::Int64CompletionCallback& error_callback,
-                             const EntryMetadata& metadata,
+                             scoped_ptr<EntryMetadata> metadata,
                              base::File::Error result);
 
   // Called when a file system provider returns chunk of read data. Note, that
@@ -85,7 +86,7 @@ class FileStreamReader : public storage::FileStreamReader {
   // or an error.
   void OnGetMetadataForGetLengthReceived(
       const net::Int64CompletionCallback& callback,
-      const EntryMetadata& metadata,
+      scoped_ptr<EntryMetadata> metadata,
       base::File::Error result);
 
   // Same as Read(), but called after initializing is completed.