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

runtime/bin/bin.gypi

Index: runtime/bin/bin.gypi
diff --git a/runtime/bin/bin.gypi b/runtime/bin/bin.gypi
index 1777513c7a3365f539b43c91814be9cb6edff4a7..03cf918c718f11a0a49e9d478ffead5777003cb5 100644
--- a/runtime/bin/bin.gypi
+++ b/runtime/bin/bin.gypi
@@ -375,6 +375,7 @@
       'dependencies': [
         'libdart_nosnapshot',
         'libdart_builtin',
+        'libdart_io',
       ],
       'include_dirs': [
         '..',
@@ -392,13 +393,16 @@
         '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"', {