add -Iinclude/private anywhere we have -Isrc/core

gyp/visualbench.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.
 # GYP file to build visual bench tool
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'visualbench',
       'type': 'executable',
       'includes' : [
         'gmslides.gypi',
       ],
       'include_dirs' : [
         '../bench',
         '../include/gpu',
+        '../include/private',
         '../src/core',
         '../src/effects',
         '../src/images',
       ],
       'sources': [
         '../gm/gm.cpp',
         '../tools/VisualBench/VisualBench.h',
         '../tools/VisualBench/VisualBench.cpp',
         '../tools/VisualBench/VisualBenchmarkStream.h',
         '../tools/VisualBench/VisualBenchmarkStream.cpp',
         '../tools/VisualBench/VisualSKPBench.h',
         '../tools/VisualBench/VisualSKPBench.cpp',
         '<!@(python find.py ../bench "*.cpp")',
       ],
       'sources!': [
         '../bench/nanobench.cpp',
         '../bench/nanobenchAndroid.cpp',
       ],
       'dependencies': [
         'etc1.gyp:libetc1',
         'flags.gyp:flags',
-        'gputest.gyp:skgputest', 
+        'gputest.gyp:skgputest',
         'skia_lib.gyp:skia_lib',
         'tools.gyp:proc_stats',
         'tools.gyp:sk_tool_utils',
         'tools.gyp:timer',
         'views.gyp:views',
       ],
       'conditions' : [
         [ 'skia_os == "android"', {
           'dependencies': [
             'android_deps.gyp:Android_VisualBench',
             'android_deps.gyp:native_app_glue',
           ],
          'link_settings': {
             'libraries': [
               '-landroid',
               '-lGLESv2',
               '-lEGL',
             ],
-          },        
+          },
         }],
       ],
     },
   ],
 }