Rename ViewportObserver to SkyEngine

sky/sdk/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.
 
 import("//mojo/public/dart/rules.gni")
 
 dart_pkg("sky") {
   sources = [
     "CHANGELOG.md",
     "bin/init.dart",
@@ skipping 69 matching lines @@
     "lib/widgets/tabs.dart",
     "lib/widgets/theme.dart",
     "lib/widgets/toggleable.dart",
     "lib/widgets/tool_bar.dart",
     "lib/widgets/widget.dart",
     "pubspec.yaml",
   ]
 
   # List of mojom targets that the sky pkg exports
   deps = [
-    "//sky/services/viewport",
+    "//sky/services/engine",
   ]
 
   datadeps = [
     "//mojo/dart/mojo_services",
     "//mojo/dart/mojom",
     "//mojo/public/dart:mojo",
     "//sky/engine/bindings",
     "//sky/services/testing",
     "//third_party/dart-pkg",
   ]
@@ skipping 26 matching lines @@
     ":sky",
   ]
 }
 
 group("sdk") {
   deps = [
     ":sky",
     ":material_design_icons",
   ]
 }