Add ImeMenuTray element.

ash/system/chromeos/ime_menu/ime_menu_tray.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_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
+#define ASH_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
+
+#include "ash/ash_export.h"
+#include "ash/common/system/ime/ime_observer.h"
+#include "ash/common/system/tray/system_tray_delegate.h"
+#include "ash/common/system/tray/tray_background_view.h"
+#include "ash/common/wm/window_state_observer.h"
+#include "base/macros.h"
+#include "ui/aura/window_observer.h"
+#include "ui/views/controls/label.h"
+
+namespace ash {
+
+class StatusAreaWidget;
+
+class ImeMenuLabel : public views::Label {
+ public:
+  ImeMenuLabel() : views::Label(base::string16()) {}
+
+  // views:Label:
+  gfx::Size GetPreferredSize() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ImeMenuLabel);

[sadrul, 2016/06/29 15:14:10]

This should go in the .cc file

[Azure Wei, 2016/06/30 00:36:30]

Done.

+};
+
+class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
+                               public IMEObserver,
+                               public wm::WindowStateObserver {
+ public:
+  explicit ImeMenuTray(StatusAreaWidget* status_area_widget);
+  ~ImeMenuTray() override;
+
+  // Sets the window state of the IME menu AppWindow.
+  void SetWindowState(wm::WindowState* window_state);
+
+  // TrayBackgroundView:
+  void SetShelfAlignment(ShelfAlignment alignment) override;
+  base::string16 GetAccessibleNameForTray() override;
+  void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
+  void ClickedOutsideBubble() override;
+  bool PerformAction(const ui::Event& event) override;
+
+  // IMEObserver:
+  void OnIMERefresh() override;
+  void OnIMEMenuActivationChanged(bool is_activated) override;
+
+  // wm::WindowStateObserver:
+  void OnPostWindowStateTypeChange(wm::WindowState* window_state,
+                                   wm::WindowStateType old_type) override;
+
+ private:
+  // To allow the test class to access GetLabelTextForTest() method.
+  friend class ImeMenuTrayTest;
+
+  // Updates the UI of the IME menu tray.
+  void UpdateTray();
+  // Sets the border of the label to keep the tray width consistant.
+  void SetLabelBorder();
+
+  // Returns the text of the tray label.
+  base::string16 GetLabelTextForTesting();

[sadrul, 2016/06/29 15:14:10]

const & (although since ImeMenuTrayTest is already a friend, do you need this
additional function? Can't it just get the text directly from |label_|?)

[Azure Wei, 2016/06/30 00:36:30]

Removed this.

+
+  ImeMenuLabel* label_;

[sadrul, 2016/06/29 15:14:10]

|label_| can be a views::Label (since ImeMenuLabel does not introduce new API.)

[Azure Wei, 2016/06/30 00:36:30]

Done.

+  ash::wm::WindowState* window_state_;
+  ash::IMEInfo current_ime_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImeMenuTray);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_