Dart: Removes all but native calls and the handle watcher from the snapshot.

sky/engine/bindings/BUILD.gn

Index: sky/engine/bindings/BUILD.gn
diff --git a/sky/engine/bindings/BUILD.gn b/sky/engine/bindings/BUILD.gn
index 7faae3229f862e040bc18eb3ff0d61acc8c35753..462c247ba69847ae1083c51c7e5f88bf9fb37fb3 100644
--- a/sky/engine/bindings/BUILD.gn
+++ b/sky/engine/bindings/BUILD.gn
@@ -55,24 +55,10 @@ action("generate_snapshot_bin") {
   inputs = [
     "//dart/runtime/tools/create_snapshot_bin.py",
     "//sky/engine/bindings/builtin.dart",
-    "//mojo/public/dart/bindings.dart",
-    "//mojo/public/dart/core.dart",
-    "//mojo/public/dart/src/application.dart",
-    "//mojo/public/dart/src/application_connection.dart",
-    "//mojo/public/dart/src/buffer.dart",
-    "//mojo/public/dart/src/codec.dart",
-    "//mojo/public/dart/src/data_pipe.dart",
-    "//mojo/public/dart/src/drain_data.dart",
-    "//mojo/public/dart/src/event_stream.dart",
-    "//mojo/public/dart/src/handle.dart",
+    "//mojo/public/dart/internal.dart",
     "//mojo/public/dart/src/handle_watcher.dart",
-    "//mojo/public/dart/src/message.dart",
-    "//mojo/public/dart/src/message_pipe.dart",
-    "//mojo/public/dart/src/proxy.dart",
-    "//mojo/public/dart/src/struct.dart",
-    "//mojo/public/dart/src/stub.dart",
+    "//mojo/public/dart/src/natives.dart",
     "//mojo/public/dart/src/timer_queue.dart",
-    "//mojo/public/dart/src/types.dart",
     "snapshot.dart",
   ]
   output = "$target_gen_dir/snapshot_gen.bin"
@@ -82,8 +68,7 @@ action("generate_snapshot_bin") {
 
   builtin_path = rebase_path("//sky/engine/bindings/builtin.dart")
   dart_sky_path = rebase_path("$bindings_output_dir/dart_sky.dart")
-  mojo_bindings_path = rebase_path("//mojo/public/dart/bindings.dart")
-  mojo_core_path = rebase_path("//mojo/public/dart/core.dart")
+  internal_path = rebase_path("//mojo/public/dart/internal.dart")
 
   gen_snapshot_dir =
       get_label_info("//dart/runtime/bin:gen_snapshot($host_toolchain)",
@@ -102,8 +87,7 @@ action("generate_snapshot_bin") {
     "--target_os",
     os,
     "--url_mapping=dart:sky,$dart_sky_path",
-    "--url_mapping=dart:mojo.bindings,$mojo_bindings_path",
-    "--url_mapping=dart:mojo.core,$mojo_core_path",
+    "--url_mapping=dart:mojo.internal,$internal_path",
     "--url_mapping=dart:sky_builtin,$builtin_path",
   ]
 }