mash: Move system tray cast code into //ash/common

ash/system/cast/tray_cast.h

-// Copyright 2015 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_CAST_TRAY_CAST_H_
-#define ASH_SYSTEM_CAST_TRAY_CAST_H_
-
-#include "ash/cast_config_delegate.h"
-#include "ash/common/shell_observer.h"
-#include "ash/common/system/tray/system_tray_item.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace tray {
-class CastTrayView;
-class CastSelectDefaultView;
-class CastDetailedView;
-class CastDuplexView;
-}  // namespace tray
-
-class ASH_EXPORT TrayCast : public SystemTrayItem,
-                            public ShellObserver,
-                            public CastConfigDelegate::Observer {
- public:
-  explicit TrayCast(SystemTray* system_tray);
-  ~TrayCast() override;
-
- private:
-  // Helper/utility methods for testing.
-  friend class TrayCastTestAPI;
-  void StartCastForTest(const std::string& receiver_id);
-  void StopCastForTest();
-  // Returns the id of the item we are currently displaying in the cast view.
-  // This assumes that the cast view is active.
-  const std::string& GetDisplayedCastId();
-  const views::View* GetDefaultView() const;
-  enum ChildViewId { TRAY_VIEW = 1, SELECT_VIEW, CAST_VIEW };
-
-  // Overridden from SystemTrayItem.
-  views::View* CreateTrayView(LoginStatus status) override;
-  views::View* CreateDefaultView(LoginStatus status) override;
-  views::View* CreateDetailedView(LoginStatus status) override;
-  void DestroyTrayView() override;
-  void DestroyDefaultView() override;
-  void DestroyDetailedView() override;
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
-
-  // Overridden from ShellObserver.
-  void OnCastingSessionStartedOrStopped(bool started) override;
-
-  // Overridden from CastConfigDelegate::Observer.
-  void OnDevicesUpdated(
-      const CastConfigDelegate::ReceiversAndActivities& devices) override;
-
-  // Returns true if the cast extension was detected.
-  bool HasCastExtension();
-
-  // This makes sure that the current view displayed in the tray is the correct
-  // one, depending on if we are currently casting. If we're casting, then a
-  // view with a stop button is displayed; otherwise, a view that links to a
-  // detail view is displayed instead that allows the user to easily begin a
-  // casting session.
-  void UpdatePrimaryView();
-
-  CastConfigDelegate::ReceiversAndActivities receivers_and_activities_;
-  bool is_casting_ = false;
-
-  bool added_observer_ = false;
-
-  // Not owned.
-  tray::CastTrayView* tray_ = nullptr;
-  tray::CastDuplexView* default_ = nullptr;
-  tray::CastDetailedView* detailed_ = nullptr;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayCast);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CAST_TRAY_CAST_H_