Select-to-speak: Stop speech when tapping Search or Control

chrome/browser/chromeos/accessibility/select_to_speak_event_handler.h

 // Copyright 2016 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_SELECT_TO_SPEAK_EVENT_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SELECT_TO_SPEAK_EVENT_HANDLER_H_
 
+#include <set>
+
 #include "base/macros.h"
 #include "ui/events/event_handler.h"
+#include "ui/events/keycodes/keyboard_codes.h"
 
 namespace chromeos {
 
 // Intercepts mouse events while the Search key is held down, and sends
 // accessibility events to the Select-to-speak extension instead.
 class SelectToSpeakEventHandler : public ui::EventHandler {
  public:
   SelectToSpeakEventHandler();
   ~SelectToSpeakEventHandler() override;
 
@@ skipping 25 matching lines @@
     MOUSE_RELEASED,
 
     // The Search key was released while the mouse was still down, cancelling
     // the Select-to-Speak event. Stay in this mode until the mouse button
     // is released, too.
     WAIT_FOR_MOUSE_RELEASE
   };
 
   State state_ = INACTIVE;
 
+  // The set of keys that are currently down. Updated whenever a key is
+  // pressed or released.
+  std::set<ui::KeyboardCode> keys_currently_down_;
+  // The set of keys that have been pressed together. Updated whenever a key
+  // is pressed, and only cleared when all keys are released.
+  std::set<ui::KeyboardCode> keys_pressed_together_;
+
   int last_view_storage_id_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(SelectToSpeakEventHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SELECT_TO_SPEAK_EVENT_HANDLER_H_