Create and show the virtual keyboard.

ui/keyboard/keyboard_controller_proxy.h

Index: ui/keyboard/keyboard_controller_proxy.h
diff --git a/ui/keyboard/keyboard_controller_proxy.h b/ui/keyboard/keyboard_controller_proxy.h
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+++ b/ui/keyboard/keyboard_controller_proxy.h
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+// Copyright (c) 2013 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 UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
+#define UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
+
+#include "ui/keyboard/keyboard_export.h"
+
+namespace aura {
+class Window;
+}
+
+namespace keyboard {
+
+// A proxy used by the KeyboardController to get access to the virtual
+// keyboard window.
+class KEYBOARD_EXPORT KeyboardControllerProxy {
+ public:
+  virtual ~KeyboardControllerProxy() {}
+
+  // Get the virtual keyboard window.  Ownership of the returned Window remains
+  // with the proxy.
+  virtual aura::Window* GetKeyboardWindow() = 0;
+};
+
+}  // namespace keyboard
+
+#endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_