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

ash/touch_hud/ash_touch_hud_export.h

Index: ash/touch_hud/ash_touch_hud_export.h
diff --git a/ash/touch_hud/ash_touch_hud_export.h b/ash/touch_hud/ash_touch_hud_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..835d4689d0ea4443bc99172ff8ce0fa9f0a12197
--- /dev/null
+++ b/ash/touch_hud/ash_touch_hud_export.h
@@ -0,0 +1,29 @@
+// 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.
+
+#ifndef ASH_TOUCH_HUD_ASH_TOUCH_HUD_EXPORT_H_
+#define ASH_TOUCH_HUD_ASH_TOUCH_HUD_EXPORT_H_
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(ASH_TOUCH_HUD_IMPLEMENTATION)
+#define ASH_TOUCH_HUD_EXPORT __declspec(dllexport)
+#else
+#define ASH_TOUCH_HUD_EXPORT __declspec(dllimport)
+#endif  // defined(ASH_TOUCH_HUD_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(ASH_TOUCH_HUD_IMPLEMENTATION)
+#define ASH_TOUCH_HUD_EXPORT __attribute__((visibility("default")))
+#else
+#define ASH_TOUCH_HUD_EXPORT
+#endif
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define ASH_TOUCH_HUD_EXPORT
+#endif
+
+#endif  // ASH_TOUCH_HUD_ASH_TOUCH_HUD_EXPORT_H_