Dart: Adds a content handler and a test.

mojo/dart/embedder/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 action("generate_snapshot_bin") {
   deps = [
     "//dart/runtime/bin:gen_snapshot",
+    "//mojo/public/interfaces/application",
   ]
   inputs = [
     "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/application.dart",
     "//mojo/public/dart/src/buffer.dart",
     "//mojo/public/dart/src/client.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/handle.dart",
     "//mojo/public/dart/src/handle_watcher.dart",
     "//mojo/public/dart/src/interface.dart",
     "//mojo/public/dart/src/message_pipe.dart",
+    "//mojo/public/dart/src/service_provider.dart",
     "//mojo/public/dart/src/timer_impl.dart",
     "//mojo/public/dart/src/timer_queue.dart",
     "//mojo/public/dart/src/types.dart",
   ]
   output = "$target_gen_dir/snapshot_gen.bin"
   outputs = [
     output,
   ]
 
   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")
+  app_interface_path = "$root_gen_dir/mojo/public/interfaces/application"
+  app_path = rebase_path("${app_interface_path}/application.mojom.dart")
+  sp_path = rebase_path("${app_interface_path}/service_provider.mojom.dart")
+  shell_path = rebase_path("${app_interface_path}/shell.mojom.dart")
   args = [
     "--executable", rebase_path("$root_out_dir/gen_snapshot"),
     "--script", rebase_path("snapshot.dart"),
     "--output_bin", rebase_path(output, root_build_dir),
     "--target_os", os,
+    "--url_mapping=dart:mojo_application,$app_path",
     "--url_mapping=dart:mojo_bindings,$bindings_path",
     "--url_mapping=dart:mojo_builtin,$builtin_path",
     "--url_mapping=dart:mojo_core,$core_path",
+    "--url_mapping=dart:mojo_service_provider,$sp_path",
+    "--url_mapping=dart:mojo_shell,$shell_path",
   ]
 }
 
 action("generate_snapshot_file") {
   deps = [
     ":generate_snapshot_bin",
   ]
   inputs = [
     "//dart/runtime/tools/create_snapshot_file.py",
     "snapshot.cc.tmpl",
@@ skipping 38 matching lines @@
 
   defines = []
   if (is_debug) {
     defines += [ "DEBUG" ]
   } else {
     defines += [ "NDEBUG" ]
   }
 
   include_dirs = [ "//dart/runtime" ]
 }