ash: Refactor touch hud drawing to ash/touch_hud as a separate component.

ash/touch_hud/BUILD.gn

-# Copyright 2015 The Chromium Authors. All rights reserved.
+# Copyright 2016 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")
 
-component("aura_extra") {
+component("touch_hud") {
   sources = [
-    "aura_extra_export.h",
-    "image_window_delegate.cc",
-    "image_window_delegate.h",
+    "ash_touch_hud_export.h",
+    "touch_hud_renderer.cc",
+    "touch_hud_renderer.h",
   ]
 
-  defines = [ "AURA_EXTRA_IMPLEMENTATION" ]
+  defines = [ "ASH_TOUCH_HUD_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//skia",
-    "//ui/aura",
-    "//ui/base",
     "//ui/compositor",
     "//ui/events",
     "//ui/gfx",
     "//ui/gfx/geometry",
+    "//ui/views",
   ]
 }