Implement progress bar spec (determinate and indeterminate).

ui/app_list/views/progress_bar_view.h

-// Copyright 2013 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 UI_APP_LIST_VIEWS_PROGRESS_BAR_VIEW_H_
-#define UI_APP_LIST_VIEWS_PROGRESS_BAR_VIEW_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "ui/views/controls/progress_bar.h"
-
-namespace views {
-class Painter;
-}
-
-namespace app_list {
-
-// ProgressBarView implements an image-based progress bar for app launcher.
-class ProgressBarView : public views::ProgressBar {
- public:
-  ProgressBarView();
-  ~ProgressBarView() override;
-
-  // views::View overrides:
-  gfx::Size GetPreferredSize() const override;
-  void OnPaint(gfx::Canvas* canvas) override;
-
- private:
-  std::unique_ptr<views::Painter> background_painter_;
-  std::unique_ptr<views::Painter> bar_painter_;
-
-  DISALLOW_COPY_AND_ASSIGN(ProgressBarView);
-};
-
-}  // namespace app_list
-
-#endif  // UI_APP_LIST_VIEWS_PROGRESS_BAR_VIEW_H_