Add Observatory to sky dart_controller

sky/shell/BUILD.gn

 # Copyright 2015 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.
 
 assert(is_android)
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 generate_jni("jni_headers") {
@@ skipping 32 matching lines @@
     "ui/engine.cc",
     "ui/engine.h",
     "ui/input_event_converter.cc",
     "ui/input_event_converter.h",
     "ui/internals.cc",
     "ui/internals.h",
     "ui_delegate.cc",
     "ui_delegate.h",
   ]
 
+  include_dirs = [
+    # Needed for 'dart:io' event handler (used in sky_main.cc).
+    rebase_path("//dart/runtime"),
+  ]
+
   deps = [
     "//base",
     "//base:i18n",
     "//build/config/sanitizers:deps",
     "//dart/runtime/bin:libdart_withcore",
     "//mojo/android:libsystem_java",
     "//mojo/common",
     "//mojo/edk/system",
     "//mojo/public/cpp/application",
     "//mojo/public/interfaces/application",
@@ skipping 39 matching lines @@
 copy_ex("assets") {
   clear_dir = true
   dest = "$root_build_dir/sky_shell/assets"
   sources = [
     "$root_build_dir/icudtl.dat",
   ]
   deps = [
     "//third_party/icu",
   ]
 }