Beginning work on GN build

runtime/bin/bin.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 239 matching lines @@
         ],
         'outputs': [
         '<(blink_cc_file)',
         ],
         'action': [
         'python',
         'tools/gen_library_src_paths.py',
         '--output', '<(blink_cc_file)',
         '--input_cc', '<(builtin_in_cc_file)',
         '--include', 'bin/builtin.h',
-        '--var_name', 'dart::bin::Builtin::blink_source_paths_',
+        '--var_name', 'dart::bin::Builtin::_blink_source_paths_',
         '--library_name', 'dart:_blink',
         '<@(_sources)',
         ],
         'message': 'Generating ''<(blink_cc_file)'' file.'
       },
       ]
     },
     {
       'target_name': 'generate_indexeddb_cc_file',
       'type': 'none',
@@ skipping 139 matching lines @@
         ],
         'outputs': [
         '<(websql_cc_file)',
         ],
         'action': [
         'python',
         'tools/gen_library_src_paths.py',
         '--output', '<(websql_cc_file)',
         '--input_cc', '<(builtin_in_cc_file)',
         '--include', 'bin/builtin.h',
-        '--var_name', 'dart::bin::Builtin::websql_source_paths_',
+        '--var_name', 'dart::bin::Builtin::web_sql_source_paths_',
         '--library_name', 'dart:web_sql',
         '<@(_sources)',
         ],
         'message': 'Generating ''<(websql_cc_file)'' file.'
       },
       ]
     },
     {
       'target_name': 'generate_svg_cc_file',
       'type': 'none',
@@ skipping 43 matching lines @@
         ],
         'outputs': [
         '<(webaudio_cc_file)',
         ],
         'action': [
         'python',
         'tools/gen_library_src_paths.py',
         '--output', '<(webaudio_cc_file)',
         '--input_cc', '<(builtin_in_cc_file)',
         '--include', 'bin/builtin.h',
-        '--var_name', 'dart::bin::Builtin::webaudio_source_paths_',
+        '--var_name', 'dart::bin::Builtin::web_audio_source_paths_',
         '--library_name', 'dart:web_audio',
         '<@(_sources)',
         ],
         'message': 'Generating ''<(webaudio_cc_file)'' file.'
       },
       ]
     },
    {
       'target_name': 'libdart_builtin',
       'type': 'static_library',
@@ skipping 902 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }