athena: Add support for virtual keyboard.

athena/virtual_keyboard/vk_message_handler.h

Index: athena/virtual_keyboard/vk_message_handler.h
diff --git a/athena/virtual_keyboard/vk_message_handler.h b/athena/virtual_keyboard/vk_message_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..1fc6c7f31bcfa58b86e5668a355bf7993b6f8849
--- /dev/null
+++ b/athena/virtual_keyboard/vk_message_handler.h
@@ -0,0 +1,36 @@
+// Copyright 2014 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 ATHENA_VIRTUAL_KEYBOARD_VK_MESSAGE_HANDLER_H_
+#define ATHENA_VIRTUAL_KEYBOARD_VK_MESSAGE_HANDLER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace athena {
+
+// Processes WebUI messages for chrome://keyboard.
+class VKMessageHandler : public content::WebUIMessageHandler {
+ public:
+  VKMessageHandler();
+  virtual ~VKMessageHandler();
+
+ private:
+  // WebUI message callbacks.
+  void SendKeyEvent(const base::ListValue* params);
+  void HideKeyboard(const base::ListValue* params);
+
+  // content::WebUIMessageHandler:
+  virtual void RegisterMessages() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(VKMessageHandler);
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_VIRTUAL_KEYBOARD_VK_MESSAGE_HANDLER_H_