Setup DiscardableMemory in the ash process

ui/aura/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("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("aura") {
   sources = [
     "../wm/public/activation_change_observer.cc",
@@ skipping 129 matching lines @@
   ]
 
   defines = [ "AURA_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//cc",
     "//cc/surfaces",
+    "//components/discardable_memory/client",
+    "//components/discardable_memory/public/interfaces",
     "//gpu/ipc/client",
     "//mojo/public/cpp/system",
     "//net",
     "//services/service_manager/public/cpp",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
     "//skia",
     "//ui/base",
     "//ui/base/ime",
     "//ui/display",
@@ skipping 213 matching lines @@
   ]
 
   if (is_linux) {
     deps += [ "//third_party/mesa" ]
   }
 
   data_deps = [
     "//third_party/mesa:osmesa",
   ]
 }