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

ash/touch_hud/BUILD.gn

Index: ash/touch_hud/BUILD.gn
diff --git a/components/favicon/ios/BUILD.gn b/ash/touch_hud/BUILD.gn
similarity index 50%
copy from components/favicon/ios/BUILD.gn
copy to ash/touch_hud/BUILD.gn
index 5a8a704c6876d093694d0c22f5d00c4cf9f12815..fdf9f0cc1708ebf3ac8e127086712173a38f009c 100644
--- a/components/favicon/ios/BUILD.gn
+++ b/ash/touch_hud/BUILD.gn
@@ -2,18 +2,23 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("ios") {
+import("//build/config/ui.gni")
+
+source_set("touch_hud") {
   sources = [
-    "favicon_url_util.cc",
-    "favicon_url_util.h",
-    "web_favicon_driver.h",
-    "web_favicon_driver.mm",
+    "touch_hud_renderer.cc",
+    "touch_hud_renderer.h",
   ]
+
   deps = [
     "//base",
-    "//components/favicon/core",
-    "//components/favicon_base",
-    "//ios/web",
+    "//skia",
+    "//ui/events",
     "//ui/gfx",
+    "//ui/views",
   ]
+
+  if (is_chromeos) {
+    deps += [ "//chromeos" ]
+  }
 }