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

ui/views/widget/desktop_aura/desktop_keyboard_capture_win.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 UI_VIEWS_WIDGET_DESKTOP_KEYBOARD_CAPTURE_WIN_H_
+#define UI_VIEWS_WIDGET_DESKTOP_KEYBOARD_CAPTURE_WIN_H_
+
+#include "ui/gfx/native_widget_types.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+// This class maintains registration of keyboard hooks and routing the low level
+// callback.
+class VIEWS_EXPORT DesktopKeyboardCaptureWin {
+ public:
+  DesktopKeyboardCaptureWin(HWND window_handle);

[sky, 2014/07/31 21:36:56]

explicit.

[Sriram, 2014/07/31 22:54:18]

Done.

+  ~DesktopKeyboardCaptureWin();
+
+  bool Capture();

[sky, 2014/07/31 21:36:55]

Make the constructor capture and the destructor release. No worry about
unbalanced calls or anything then.

[Sriram, 2014/07/31 22:54:18]

Done.

+  void Release();
+
+ private:
+  bool registered_;
+  HWND window_handle_;
+};

[sky, 2014/07/31 21:36:55]

DISALLOW...

[Sriram, 2014/07/31 22:54:18]

Done.

+}
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_KEYBOARD_CAPTURE_WIN_H_