Enable NVPR with command buffer

gyp/ports.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Port-specific Skia library code.
 {
   'targets': [
     {
       'target_name': 'ports',
       'product_name': 'skia_ports',
@@ skipping 31 matching lines @@
         '../src/ports/SkFontMgr_win_dw_factory.cpp',
         '../src/ports/SkFontMgr_win_gdi_factory.cpp',
         '../src/ports/SkRemotableFontMgr_win_dw.cpp',
         '../src/ports/SkScalerContext_win_dw.cpp',
         '../src/ports/SkScalerContext_win_dw.h',
         '../src/ports/SkTypeface_win_dw.cpp',
         '../src/ports/SkTypeface_win_dw.h',
 
         '../src/ports/SkGlobalInitialization_default.cpp',
         '../src/ports/SkMemory_malloc.cpp',
+        '../src/ports/SkOSEnvironment.h',
+        '../src/ports/SkOSEnvironment.cpp',
         '../src/ports/SkOSFile_posix.cpp',
         '../src/ports/SkOSFile_stdio.cpp',
         '../src/ports/SkOSFile_win.cpp',
         '../src/ports/SkOSLibrary.h',
         '../src/ports/SkOSLibrary_posix.cpp',
         '../src/ports/SkOSLibrary_win.cpp',
         '../src/ports/SkDiscardableMemory_none.cpp',
         '../src/ports/SkTime_Unix.cpp',
         '../src/ports/SkTime_win.cpp',
         '../src/ports/SkTLS_pthread.cpp',
@@ skipping 149 matching lines @@
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/ports',
         ],
       },
     },
   ],
 }