[NaCl SDK] Add URLLoader fake pepper interface.

native_client_sdk/src/libraries/nacl_io/mount_node_http.h

Index: native_client_sdk/src/libraries/nacl_io/mount_node_http.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_node_http.h b/native_client_sdk/src/libraries/nacl_io/mount_node_http.h
index 0e083b463c64582d7dce95106b601881dacdb1a0..9ea5f147192d81141998b180225e438e2e9c2cb9 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_node_http.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_node_http.h
@@ -52,11 +52,14 @@ class MountNodeHttp : public MountNode {
                 StringMap_t* out_response_headers);
 
   Error DownloadToCache();
-  Error ReadPartialFromCache(size_t offs,
+  Error ReadPartialFromCache(const HandleAttr& attr,
                              void* buf,
                              int count,
                              int* out_bytes);
-  Error DownloadPartial(size_t offs, void* buf, size_t count, int* out_bytes);
+  Error DownloadPartial(const HandleAttr& attr,
+                        void* buf,
+                        size_t count,
+                        int* out_bytes);
   Error DownloadToBuffer(PP_Resource loader,
                          void* buf,
                          int count,