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

ash/ash_touch_hud.gyp

+# 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+    # These files lists are shared with the GN build.
+    'touch_hud_sources': [
+      'touch_hud/ash_touch_hud_export.h',
+      'touch_hud/touch_hud_renderer.cc',
+      'touch_hud/touch_hud_renderer.h',
+     ],
+  },
+  'targets': [
+    {
+      # GN version: //ash/touch_hud
+      'target_name': 'ash_touch_hud',
+      'type': '<(component)',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../skia/skia.gyp:skia',
+        '../ui/compositor/compositor.gyp:compositor',
+        '../ui/events/events.gyp:events',
+        '../ui/gfx/gfx.gyp:gfx',
+        '../ui/gfx/gfx.gyp:gfx_geometry',
+        '../ui/views/views.gyp:views',
+      ],
+      'defines': [
+        'ASH_TOUCH_HUD_IMPLEMENTATION',
+      ],
+      'sources': [
+        '<@(touch_hud_sources)',
+      ],
+    },
+  ],
+}