[gn] Move build to gypfiles

src/d8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 15 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'v8_code': 1,
     # Enable support for Intel VTune. Supported on ia32/x64 only
     'v8_enable_vtunejit%': 0,
     'v8_enable_i18n_support%': 1,
     'v8_toolset_for_d8%': 'target',
   },
-  'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
+  'includes': ['../gypfiles/toolchain.gypi', '../gypfiles/features.gypi'],
   'targets': [
     {
       'target_name': 'd8',
       'type': 'executable',
       'dependencies': [
         'v8.gyp:v8',
         'v8.gyp:v8_libplatform',
       ],
       # Generated source files need this explicitly:
       'include_dirs+': [
@@ skipping 96 matching lines @@
   'conditions': [
     ['test_isolation_mode != "noop" and v8_toolset_for_d8 == "target"', {
       'targets': [
         {
           'target_name': 'd8_run',
           'type': 'none',
           'dependencies': [
             'd8',
           ],
           'includes': [
-            '../build/isolate.gypi',
+            '../gypfiles/isolate.gypi',
           ],
           'sources': [
             'd8.isolate',
           ],
         },
       ],
     }],
   ],
 }