Add virtual keyboard item into opt-in IME menu.

ash/common/system/chromeos/ime_menu/ime_menu_tray.h

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray.h
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
index 6ba4692dc50731cea117bb01d69160c8c368ab68..b823419bd332428387815a233f6a37c69b7c8b17 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.h
@@ -6,6 +6,7 @@
 #define ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/common/system/ime/ime_observer.h"
 #include "ash/common/system/tray/ime_info.h"
 #include "ash/common/system/tray/tray_background_view.h"
@@ -28,7 +29,8 @@ class WmWindow;
 class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
                                public IMEObserver,
                                public views::TrayBubbleView::Delegate,
-                               public keyboard::KeyboardControllerObserver {
+                               public keyboard::KeyboardControllerObserver,
+                               public VirtualKeyboardObserver {
  public:
   explicit ImeMenuTray(WmShelf* wm_shelf);
   ~ImeMenuTray() override;
@@ -49,6 +51,10 @@ class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
   // Returns true if it should block the auto hide behavior of the shelf.
   bool ShouldBlockShelfAutoHide() const;
 
+  // Returns whether the virtual keyboard toggle should be shown in the
+  // detailed view.
+  bool ShouldShowKeyboardToggle() const;
+
   // TrayBackgroundView:
   void SetShelfAlignment(ShelfAlignment alignment) override;
   base::string16 GetAccessibleNameForTray() override;
@@ -79,6 +85,9 @@ class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
   void OnKeyboardClosed() override;
   void OnKeyboardHidden() override;
 
+  // VirtualKeyboardObserver.
+  void OnKeyboardSuppressionChanged(bool suppressed) override;
+
  private:
   // To allow the test class to access |label_|.
   friend class ImeMenuTrayTest;
@@ -95,6 +104,7 @@ class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
   bool show_keyboard_;
   bool force_show_keyboard_;
   bool should_block_shelf_auto_hide_;
+  bool keyboard_suppressed_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeMenuTray);
 };