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

gyp/opts.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 for building opts target.
 {
   # Source lists live in opts.gypi.  This makes it easier to maintain our Chrome GYP/GN setup.
   # (To be honest, I'm not sure why we need to include common.gypi.  I thought it was automatic.)
   'variables': {
     'includes': [ 'common.gypi', 'opts.gypi' ],
   },
 
   # Generally we shove things into one 'opts' target conditioned on platform.
   # If a particular platform needs some files built with different flags,
   # those become separate targets: opts_ssse3, opts_sse41, opts_neon.
 
   'targets': [
     {
       'target_name': 'opts',
       'product_name': 'skia_opts',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
         'effects.gyp:*'
       ],
       'include_dirs': [
+        '../include/private',
         '../src/core',
         '../src/opts',
         '../src/utils',
         '../include/utils',
       ],
       'conditions': [
         [ '"x86" in skia_arch_type and skia_os != "ios"', {
           'cflags': [ '-msse2' ],
           'dependencies': [ 'opts_ssse3', 'opts_sse41' ],
           'sources': [ '<@(sse2_sources)' ],
@@ skipping 43 matching lines @@
           ]
         }],
       ],
     },
     {
       'target_name': 'opts_ssse3',
       'product_name': 'skia_opts_ssse3',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [ 'core.gyp:*' ],
-      'include_dirs': [ '../src/core' ],
+      'include_dirs': [
+          '../include/private',
+          '../src/core',
+      ],
       'sources': [ '<@(ssse3_sources)' ],
       'conditions': [
         [ 'skia_os == "win"', {
             'defines' : [ 'SK_CPU_SSE_LEVEL=31' ],
         }],
         [ 'not skia_android_framework', {
           'cflags': [ '-mssse3' ],
         }],
       ],
     },
     {
       'target_name': 'opts_sse41',
       'product_name': 'skia_opts_sse41',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [ 'core.gyp:*' ],
+      'include_dirs': [
+          '../include/private',
+          '../src/core',
+      ],
       'sources': [ '<@(sse41_sources)' ],
       'conditions': [
         [ 'skia_os == "win"', {
             'defines' : [ 'SK_CPU_SSE_LEVEL=41' ],
         }],
         [ 'not skia_android_framework', {
           'cflags': [ '-msse4.1' ],
         }],
         [ 'skia_os == "mac"', {
           'xcode_settings': { 'GCC_ENABLE_SSE41_EXTENSIONS': 'YES' },
         }],
       ],
     },
     {
       'target_name': 'opts_neon',
       'product_name': 'skia_opts_neon',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
         'effects.gyp:*'
       ],
       'include_dirs': [
+        '../include/private',
         '../src/core',
         '../src/opts',
         '../src/utils',
       ],
       'sources': [ '<@(neon_sources)' ],
       'cflags!': [
         '-fno-omit-frame-pointer',
         '-mfpu=vfp',  # remove them all, just in case.
         '-mfpu=vfpv3',
         '-mfpu=vfpv3-d16',
       ],
       'conditions': [
         [ 'not skia_android_framework', {
           'cflags': [
             '-mfpu=neon',
             '-fomit-frame-pointer',
           ],
         }],
       ],
       'ldflags': [
         '-march=armv7-a',
         '-Wl,--fix-cortex-a8',
       ],
     },
   ],
 }