GN: Add mojo_shell_tests, get more things working on android

mojo/services/view_manager/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.
 
+import("//mojo/system.gni")
+
 component("view_manager") {
   deps = [
     "//base",
     "//cc",
     "//mojo/cc",
     "//mojo/common",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/application:chromium",
     "//mojo/public/cpp/application:main_chromium",
     "//mojo/public/gles2",
     "//mojo/services/public/cpp/geometry",
     "//mojo/services/public/cpp/input_events",
     "//mojo/services/public/cpp/view_manager:common",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/input_events",
     "//mojo/services/public/interfaces/native_viewport",
     "//mojo/services/public/interfaces/view_manager",
     "//skia",
     "//ui/aura",
     "//ui/base",
     "//ui/compositor",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//webkit/common/gpu",
   ]
+  deps += mojo_system_for_component
 
   defines = [
     "MOJO_VIEW_MANAGER_IMPLEMENTATION",
   ]
 
   sources = [
     "access_policy.h",
     "access_policy_delegate.h",
     "context_factory_impl.cc",
     "context_factory_impl.h",
@@ skipping 16 matching lines @@
     "view_manager_init_service_context.h",
     "view_manager_init_service_impl.cc",
     "view_manager_init_service_impl.h",
     "view_manager_service_impl.cc",
     "view_manager_service_impl.h",
     "window_manager_access_policy.cc",
     "window_manager_access_policy.h",
     "window_tree_host_impl.cc",
     "window_tree_host_impl.h",
   ]
-
-  if (is_component_build) {
-    deps += [ "//mojo/system" ]
-  }
 }