Add stub PPAPI for launching NaCl's sel_ldr process.

ppapi/ppapi.gyp

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../third_party/mesa/mesa.gypi',
   ],
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
@@ skipping 82 matching lines @@
         'c/dev/ppb_zoom_dev.h',
         'c/dev/ppp_cursor_control_dev.h',
         'c/dev/ppp_find_dev.h',
         'c/dev/ppp_graphics_3d_dev.h',
         'c/dev/ppp_scrollbar_dev.h',
         'c/dev/ppp_selection_dev.h',
         'c/dev/ppp_printing_dev.h',
         'c/dev/ppp_widget_dev.h',
         'c/dev/ppp_zoom_dev.h',
 
+        # Private interfaces.
+        'c/private/ppb_nacl_util_private.h',
+
         # Deprecated interfaces.
         'c/dev/deprecated_bool.h',
         'c/dev/ppb_var_deprecated.h',
         'c/dev/ppp_class_deprecated.h',
 
         # Trusted interfaces.
         'c/trusted/ppb_image_data_trusted.h',
         'c/trusted/ppb_url_loader_trusted.h',
       ],
     },
@@ skipping 553 matching lines @@
         ['OS=="win"', {
         }],
         ['OS=="linux"', {
         }],
         ['OS=="mac"', {
         }]
       ],
     },
   ],
 }