Support Windows FILE_FLAG_SEQUENTIAL_SCAN in base::File.

base/files/file_win.cc

Index: base/files/file_win.cc
diff --git a/base/files/file_win.cc b/base/files/file_win.cc
index ce38d0b0e2af276a080105374d1d0fa5fc10c282..2d75ca2f57be98205402365e8c563110747e2f23 100644
--- a/base/files/file_win.cc
+++ b/base/files/file_win.cc
@@ -375,6 +375,8 @@ void File::DoInitialize(const FilePath& path, uint32 flags) {
     create_flags |= FILE_FLAG_DELETE_ON_CLOSE;
   if (flags & FLAG_BACKUP_SEMANTICS)
     create_flags |= FILE_FLAG_BACKUP_SEMANTICS;
+  if (flags & FLAG_SEQUENTIAL_SCAN)
+    create_flags |= FILE_FLAG_SEQUENTIAL_SCAN;
 
   file_.Set(CreateFile(path.value().c_str(), access, sharing, NULL,
                        disposition, create_flags, NULL));