Automatically remap Command key on an Apple keyboard to Control [part 1 of 2 - Ash part]

ash/wm/key_rewriter_event_filter.h

Index: ash/wm/key_rewriter_event_filter.h
diff --git a/ash/wm/key_rewriter_event_filter.h b/ash/wm/key_rewriter_event_filter.h
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+++ b/ash/wm/key_rewriter_event_filter.h
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+// 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_WM_KEY_REWRITER_EVENT_FILTER_
+#define ASH_WM_KEY_REWRITER_EVENT_FILTER_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/event_filter.h"
+
+namespace ash {
+
+class KeyRewriterDelegate;
+
+namespace internal {
+
+// An event filter that rewrites or drops a key event.
+class ASH_EXPORT KeyRewriterEventFilter : public aura::EventFilter {
+ public:
+  KeyRewriterEventFilter();
+  virtual ~KeyRewriterEventFilter();
+
+  void SetKeyRewriterDelegate(scoped_ptr<KeyRewriterDelegate> delegate);
+
+ private:
+  // Overridden from aura::EventFilter:
+  virtual bool PreHandleKeyEvent(aura::Window* target,
+                                 aura::KeyEvent* event) OVERRIDE;
+  virtual bool PreHandleMouseEvent(aura::Window* target,
+                                   aura::MouseEvent* event) OVERRIDE;
+  virtual ui::TouchStatus PreHandleTouchEvent(
+      aura::Window* target,
+      aura::TouchEvent* event) OVERRIDE;
+  virtual ui::GestureStatus PreHandleGestureEvent(
+      aura::Window* target,
+      aura::GestureEvent* event) OVERRIDE;
+
+  scoped_ptr<KeyRewriterDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyRewriterEventFilter);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_KEY_REWRITER_EVENT_FILTER_