API proposal for chrome.app.window to intercept all keys.

chrome/browser/ui/views/apps/keyboard_hook_handler.h

+// 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 CHROME_BROWSER_UI_VIEWS_APPS_KEYBOARD_HOOK_HANDLER_H_
+#define CHROME_BROWSER_UI_VIEWS_APPS_KEYBOARD_HOOK_HANDLER_H_
+
+#include "ui/views/widget/widget.h"
+
+// Interface to control keyboard hook on different platform.
+class KeyboardHookHandler {
+ public:
+  // Request all keyboard events to be routed to the given window.
+  void Register(views::Widget* widget);
+
+  // Release the request for all keyboard events.
+  void Deregister(views::Widget* widget);
+
+  // Implemented in platform specific code.
+  static KeyboardHookHandler* GetInstance();
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_APPS_KEYBOARD_HOOK_HANDLER_H_