Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/palette_delegate.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_PALETTE_DELEGATE_H_
-#define ASH_PALETTE_DELEGATE_H_
-
-#include "ash/ash_export.h"
-#include "base/callback.h"
-#include "base/callback_list.h"
-#include "base/macros.h"
-#include "ui/events/devices/stylus_state.h"
-
-namespace ash {
-
-// This delegate allows the UI code in ash, e.g. |PaletteTray|, to perform
-// Chrome-specific actions.
-class PaletteDelegate {
- public:
-  using EnableListener = base::Callback<void(bool)>;
-  using EnableListenerSubscription =
-      base::CallbackList<void(bool)>::Subscription;
-
-  virtual ~PaletteDelegate() {}
-
-  // Sets callback function that will receive the current state of the palette
-  // enabled pref. The callback will be invoked once the initial pref value is
-  // available.
-  virtual std::unique_ptr<EnableListenerSubscription> AddPaletteEnableListener(
-      const EnableListener& on_state_changed) = 0;
-
-  // Create a new note.
-  virtual void CreateNote() = 0;
-
-  // Returns true if there is a note-taking application available.
-  virtual bool HasNoteApp() = 0;
-
-  // Returns true if the palette should be automatically opened on an eject
-  // event.
-  virtual bool ShouldAutoOpenPalette() = 0;
-
-  // Returns true if the palette should be displayed. This is the one-shot
-  // equivalent to AddPaletteEnableListener.
-  virtual bool ShouldShowPalette() = 0;
-
-  // Take a screenshot of the entire window.
-  virtual void TakeScreenshot() = 0;
-
-  // Take a screenshot of a user-selected region. |done| is called when the
-  // partial screenshot session has finished; a screenshot may or may not have
-  // been taken.
-  virtual void TakePartialScreenshot(const base::Closure& done) = 0;
-
-  // Cancels any active partial screenshot session.
-  virtual void CancelPartialScreenshot() = 0;
-
- private:
-  DISALLOW_ASSIGN(PaletteDelegate);
-};
-
-}  // namespace ash
-
-#endif  // ASH_PALETTE_DELEGATE_H_