mash: Migrate some system user files to common.

ash/system/user/button_from_view.h

Index: ash/system/user/button_from_view.h
diff --git a/ash/system/user/button_from_view.h b/ash/system/user/button_from_view.h
deleted file mode 100644
index fb39b505780f3b9d09063808a7946b4641e0a9c8..0000000000000000000000000000000000000000
--- a/ash/system/user/button_from_view.h
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright 2014 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_SYSTEM_USER_BUTTON_FROM_VIEW_H_
-#define ASH_SYSTEM_USER_BUTTON_FROM_VIEW_H_
-
-#include "base/macros.h"
-#include "ui/gfx/geometry/insets.h"
-#include "ui/views/controls/button/custom_button.h"
-
-namespace ash {
-namespace tray {
-
-// This view is used to wrap it's content and transform it into button.
-class ButtonFromView : public views::CustomButton {
- public:
-  // The |content| is the content which is shown within the button. The
-  // |button_listener| will be informed - if provided - when a button was
-  // pressed. If |highlight_on_hover| is set to true, the button will be
-  // highlighted upon hover and show the accessibility caret.
-  // The |tab_frame_inset| will be used to inset the blue tab frame inside the
-  // button.
-  // An accessible label gets computed based upon descendant views of this view.
-  ButtonFromView(views::View* content,
-                 views::ButtonListener* listener,
-                 bool highlight_on_hover,
-                 const gfx::Insets& tab_frame_inset);
-  ~ButtonFromView() override;
-
-  // Called when the border should remain even in the non highlighted state.
-  void ForceBorderVisible(bool show);
-
-  // Overridden from views::View
-  void OnMouseEntered(const ui::MouseEvent& event) override;
-  void OnMouseExited(const ui::MouseEvent& event) override;
-  void OnPaint(gfx::Canvas* canvas) override;
-  void OnFocus() override;
-  void OnBlur() override;
-  void GetAccessibleState(ui::AXViewState* state) override;
-
-  // Check if the item is hovered.
-  bool is_hovered_for_test() { return button_hovered_; }
-
- private:
-  // Change the hover/active state of the "button" when the status changes.
-  void ShowActive();
-
-  // Content of button.
-  views::View* content_;
-
-  // Whether button should be highligthed on hover.
-  bool highlight_on_hover_;
-
-  // True if button is hovered.
-  bool button_hovered_;
-
-  // True if the border should be always visible.
-  bool show_border_;
-
-  // The insets which get used for the drawn accessibility (tab) frame.
-  gfx::Insets tab_frame_inset_;
-
-  DISALLOW_COPY_AND_ASSIGN(ButtonFromView);
-};
-
-}  // namespace tray
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_USER_BUTTON_FROM_VIEW_H_