Handle Caps Lock short cut (Shift+Search) in ash [part 1 of 2].

ash/caps_lock_delegate.h

+// 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_CAPS_LOCK_DELEGATE_H_
+#define ASH_CAPS_LOCK_DELEGATE_H_
+#pragma once
+
+namespace ash {
+
+// Delegate for toggling Caps Lock.
+class CapsLockDelegate {
+ public:
+  virtual ~CapsLockDelegate() {}
+
+  // A derived class should do either of the following: 1) toggle Caps Lock and
+  // return true, or 2) do nothing and return false (see crosbug.com/110127).
+  virtual bool HandleToggleCapsLock() = 0;
+};
+}  // namespace ash
+
+#endif  // ASH_CAPS_LOCK_DELEGATE_H_