Bring up the service isolate and use it for package resolution in gen_snapshot

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 357 matching lines @@
       ],
     },
     {
       # Completely statically linked binary for generating snapshots.
       'target_name': 'gen_snapshot',
       'type': 'executable',
       'toolsets':['host'],
       'dependencies': [
         'libdart_nosnapshot',
         'libdart_builtin',
+        'libdart_io',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'address_sanitizer.cc',
         'gen_snapshot.cc',
         # Very limited native resolver provided.
         'builtin_gen_snapshot.cc',
         'builtin_common.cc',
         'builtin.cc',
         'builtin.h',
         'platform_android.cc',
         'platform_linux.cc',
         'platform_macos.cc',
         'platform_win.cc',
         'platform.h',
+        'vmservice_impl.cc',
+        'vmservice_impl.h',
         # Include generated source files.
         '<(builtin_cc_file)',
         '<(io_cc_file)',
         '<(io_patch_cc_file)',
+        '<(resources_cc_file)',
       ],
       'defines': [
-        'PLATFORM_DISABLE_SOCKET'
+        'PLATFORM_DISABLE_SOCKET',
       ],
       'conditions': [
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib' ],
           },
         }],
       ],
     },
     {
@@ skipping 397 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }