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

mojo/dart/embedder/test/BUILD.gn

Index: mojo/dart/embedder/test/BUILD.gn
diff --git a/mojo/dart/embedder/test/BUILD.gn b/mojo/dart/embedder/test/BUILD.gn
index 9e85b1636026f9af5286919bad5e7dbadcbe9ad4..f3f8fe5c5e99747a69ead268db2173f6dcf479ac 100644
--- a/mojo/dart/embedder/test/BUILD.gn
+++ b/mojo/dart/embedder/test/BUILD.gn
@@ -13,22 +13,10 @@ action("generate_test_snapshot_bin") {
     "test_snapshot.dart",
     "//dart/runtime/tools/create_snapshot_bin.py",
     "//mojo/dart/embedder/builtin.dart",
-    "//mojo/public/dart/bindings.dart",
-    "//mojo/public/dart/core.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",
   ]
   output = "$target_gen_dir/test_snapshot_gen.bin"
   outputs = [
@@ -40,8 +28,7 @@ action("generate_test_snapshot_bin") {
                      "root_out_dir")
   script = "//dart/runtime/tools/create_snapshot_bin.py"
   builtin_path = rebase_path("//mojo/dart/embedder/builtin.dart")
-  bindings_path = rebase_path("//mojo/public/dart/bindings.dart")
-  core_path = rebase_path("//mojo/public/dart/core.dart")
+  internal_path = rebase_path("//mojo/public/dart/internal.dart")
   args = [
     "--executable",
     rebase_path("$gen_snapshot_dir/gen_snapshot"),
@@ -53,9 +40,8 @@ action("generate_test_snapshot_bin") {
     rebase_path(output, root_build_dir),
     "--target_os",
     os,
-    "--url_mapping=dart:mojo.bindings,$bindings_path",
     "--url_mapping=dart:mojo.builtin,$builtin_path",
-    "--url_mapping=dart:mojo.core,$core_path",
+    "--url_mapping=dart:mojo.internal,$internal_path",
   ]
 }
 
@@ -84,6 +70,36 @@ action("generate_test_snapshot_file") {
   ]
 }
 
+# These go into the generated source directory for embedder tests.
+copy("copy_dart_mojo_sdk") {
+  sources = [
+    "//mojo/public/dart/application.dart",
+    "//mojo/public/dart/bindings.dart",
+    "//mojo/public/dart/core.dart",
+    "//mojo/public/dart/internal.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/src/handle_watcher.dart",
+    "//mojo/public/dart/src/message.dart",
+    "//mojo/public/dart/src/message_pipe.dart",
+    "//mojo/public/dart/src/natives.dart",
+    "//mojo/public/dart/src/proxy.dart",
+    "//mojo/public/dart/src/struct.dart",
+    "//mojo/public/dart/src/stub.dart",
+    "//mojo/public/dart/src/timer_queue.dart",
+    "//mojo/public/dart/src/types.dart",
+  ]
+  outputs = [
+    "{{source_gen_dir}}/{{source_file_part}}",
+  ]
+}
+
 source_set("dart_controller_for_test") {
   testonly = true
   sources = [
@@ -103,6 +119,7 @@ test("dart_unittests") {
   ]
   deps = [
     ":async_helper",
+    ":copy_dart_mojo_sdk",
     ":dart_controller_for_test",
     ":dart_to_cpp_unittests",
     ":expect",