Proposed alternative for supporting ChromeVox keyboard commands.

chrome/browser/chromeos/accessibility/spoken_feedback_event_rewriter.h

+// Copyright 2015 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_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
+#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
+
+#include "ui/events/event_rewriter.h"
+
+// SpokenFeedbackEventRewriter discards all keyboard events mapped by the spoken
+// feedback manifest commands block. It dispatches the associated command name
+// directly to spoken feedback. This only occurs whenever spoken feedback is
+// enabled.
+class SpokenFeedbackEventRewriter : public ui::EventRewriter {
+ public:
+  SpokenFeedbackEventRewriter();
+  ~SpokenFeedbackEventRewriter() override;
+
+  // EventRewriter:
+  ui::EventRewriteStatus RewriteEvent(
+      const ui::Event& event,
+      scoped_ptr<ui::Event>* new_event) override;
+  ui::EventRewriteStatus NextDispatchEvent(
+      const ui::Event& last_event,
+      scoped_ptr<ui::Event>* new_event) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SpokenFeedbackEventRewriter);
+};
+
+#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_