Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/ozone/evdev/mouse_button_map_evdev.h

Index: ui/events/ozone/evdev/mouse_button_map_evdev.h
diff --git a/ui/events/ozone/evdev/mouse_button_map_evdev.h b/ui/events/ozone/evdev/mouse_button_map_evdev.h
new file mode 100644
index 0000000000000000000000000000000000000000..5cc240dfdeea6c1cb292f3437d097f0caf7abc02
--- /dev/null
+++ b/ui/events/ozone/evdev/mouse_button_map_evdev.h
@@ -0,0 +1,53 @@
+// 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 UI_EVENTS_OZONE_EVDEV_MOUSE_BUTTON_MAP_EVDEV_H_
+#define UI_EVENTS_OZONE_EVDEV_MOUSE_BUTTON_MAP_EVDEV_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
+
+namespace ui {
+
+// Mouse button map for Evdev.
+//
+// Chrome relies on the underlying OS to interpret mouse buttons. The Linux
+// input subsystem does not assign any special meaning to these keys, so
+// this work must happen at a higher layer (normally X11 or the console driver).
+// When using evdev directly, we must do it ourselves.
+//
+// The mouse button map is shared between all input devices connected to the
+// system.
+class EVENTS_OZONE_EVDEV_EXPORT MouseButtonMapEvdev {
+ public:
+  typedef uint32_t Button;
+  typedef std::map<uint32_t, uint32_t> ButtonMap;
+
+  MouseButtonMapEvdev();
+  ~MouseButtonMapEvdev();
+
+  // Set mapping for one button.
+  void UpdateButtonMap(Button button_from, Button button_to);
+
+  // Reset the button map to the system default.
+  void ResetButtonMap();
+
+  // Return the mapped button.
+  int GetMappedButton(const Button button) const;
+
+  // Return current button map to use for incoming events.
+  const ButtonMap& button_map() { return button_map_; }
+
+ private:
+  // Mouse button map.
+  ButtonMap button_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseButtonMapEvdev);
+};
+
+}  // namspace ui
+
+#endif  // UI_EVENTS_OZONE_EVDEV_MOUSE_BUTTON_MAP_EVDEV_H_