Add Observatory to sky dart_controller

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.
 
 # embedder specific template rules.
 import("embedder.gni")
 
 source_set("dart_controller_no_snapshot") {
   sources = [
     "$target_gen_dir/dart_embedder_patch_resources.cc",
@@ skipping 51 matching lines @@
 
 dart_embedder_resources("generate_dart_embedder_patch_resources_cc") {
   inputs = [
     "//mojo/dart/embedder/core/natives_patch.dart",
     "//mojo/dart/embedder/io/internet_address_patch.dart",
     "//mojo/dart/embedder/io/mojo_patch.dart",
     "//mojo/dart/embedder/io/platform_patch.dart",
     "//mojo/dart/embedder/io/socket_patch.dart",
     "//mojo/dart/embedder/io/server_socket_patch.dart",
   ]
+  root_prefix = "//mojo/dart/embedder/"
   output = "$target_gen_dir/dart_embedder_patch_resources.cc"
   table_name = "dart_embedder_patch"
 }
 
 group("dart_embedder_packages") {
   deps = [
     ":dart_embedder_package_sdk",
     ":dart_embedder_package_application",
     ":dart_embedder_package_bindings",
     ":dart_embedder_package_network_service",
@@ skipping 54 matching lines @@
 dart_embedder_resources("generate_dart_embedder_service_isolate_resources_cc") {
   deps = [
     ":deploy_observatory",
   ]
   inputs = [
     "//mojo/dart/embedder/vmservice/loader.dart",
     "//mojo/dart/embedder/vmservice/main.dart",
     "//mojo/dart/embedder/vmservice/resources.dart",
     "//mojo/dart/embedder/vmservice/server.dart",
   ]
+  root_prefix = "//mojo/dart/embedder/"
   input_directory = "$root_out_dir/observatory/deployed/web/"
   output = "$target_gen_dir/dart_embedder_service_isolate_resources.cc"
   table_name = "dart_embedder_service_isolate"
 }
 
 observatory_sources_gypi =
     exec_script("../../../dart/tools/gypi_to_gn.py",
                 [ rebase_path(
                     "//dart/runtime/observatory/observatory_sources.gypi") ],
                 "scope",
@@ skipping 237 matching lines @@
     "--vm_input_bin",
     rebase_path("$target_gen_dir/vm_isolate_snapshot.bin"),
     "--input_bin",
     rebase_path("$target_gen_dir/isolate_snapshot.bin"),
     "--input_cc",
     rebase_path("//mojo/dart/embedder/snapshot.cc.tmpl"),
     "--output",
     rebase_path(output),
   ]
 }