chromeos: Move files in //ash/common to //ash, part 1

ash/common/system/tray/tray_popup_ink_drop_style.h

-// 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_COMMON_SYSTEM_TRAY_TRAY_POPUP_INK_DROP_STYLE_H_
-#define ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_INK_DROP_STYLE_H_
-
-namespace ash {
-
-// The different styles of ink drops applied to the system menu.
-enum class TrayPopupInkDropStyle {
-  // Used for targets where the user doesn't need to know the exact targetable
-  // area and they are expected to target an icon centered in the targetable
-  // space. Highlight and ripple are drawn as a circle.
-  HOST_CENTERED,
-  // Used for targets where the user should know the targetable bounds but
-  // where the ink drop shouldn't fill the entire bounds. e.g. row of buttons
-  // separated with separators.
-  INSET_BOUNDS,
-  // Used for targets that should indicate to the user what the actual
-  // targetable bounds are. e.g. a full system menu row.
-  FILL_BOUNDS
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_INK_DROP_STYLE_H_