Revert of chromeos: Remove some IME methods from ash::SystemTrayDelegate

ash/ime_control_delegate.h

Index: ash/ime_control_delegate.h
diff --git a/ash/ime_control_delegate.h b/ash/ime_control_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..5dbc52c0a70b4e5bb5989cf9fb199da288838728
--- /dev/null
+++ b/ash/ime_control_delegate.h
@@ -0,0 +1,40 @@
+// Copyright (c) 2012 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_IME_CONTROL_DELEGATE_H_
+#define ASH_IME_CONTROL_DELEGATE_H_
+
+namespace ui {
+class Accelerator;
+}  // namespace ui
+
+namespace ash {
+
+// Delegate for controlling IME (input method editor).
+class ImeControlDelegate {
+ public:
+  virtual ~ImeControlDelegate() {}
+
+  // Returns whether a user can cycle through IMEs. Returns false if only one
+  // IME is enabled.
+  virtual bool CanCycleIme() = 0;
+
+  // Changes the IME to what is listed next.
+  virtual void HandleNextIme() = 0;
+
+  // Changes the IME to previously selected one. If there is no previously
+  // selected IMEs, chooses the next listed IME.
+  virtual void HandlePreviousIme() = 0;
+
+  // Returns true if the IME can be switched to the IME associated with
+  // |accelerator|.
+  virtual bool CanSwitchIme(const ui::Accelerator& accelerator) = 0;
+
+  // Switches to the IME associated with |accelerator|.
+  virtual void HandleSwitchIme(const ui::Accelerator& accelerator) = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_IME_CONTROL_DELEGATE_H_