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

ui/events/ozone/evdev/mouse_button_map_evdev.cc

+// 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.
+
+#include "ui/events/ozone/evdev/mouse_button_map_evdev.h"
+
+#include <linux/input.h>
+
+#include "base/logging.h"
+
+namespace ui {
+
+namespace {
+
+// Defines the range of button codes that we support.
+//
+// Check linux/input.h for more info.
+const MouseButtonMapEvdev::Button kMinMouseButtonCode = BTN_MISC;
+const MouseButtonMapEvdev::Button kMaxMouseButtonCode = BTN_GEAR_UP;
+
+bool IsMouseButton(const MouseButtonMapEvdev::Button button) {
+  return (button >= kMinMouseButtonCode && button <= kMaxMouseButtonCode);
+}
+
+}  // namespace
+
+MouseButtonMapEvdev::MouseButtonMapEvdev() {
+  ResetButtonMap();
+}
+
+MouseButtonMapEvdev::~MouseButtonMapEvdev() {
+}
+
+void MouseButtonMapEvdev::UpdateButtonMap(Button button_from,
+                                          Button button_to) {
+  DCHECK(IsMouseButton(button_from) && IsMouseButton(button_to));
+  button_map_[button_from] = button_to;
+}
+
+void MouseButtonMapEvdev::ResetButtonMap() {
+  button_map_.clear();
+  for (Button i = kMinMouseButtonCode; i <= kMaxMouseButtonCode; ++i)
+    button_map_[i] = i;
+}
+
+int MouseButtonMapEvdev::GetMappedButton(const Button button) const {
+  ButtonMap::const_iterator it = button_map_.find(button);
+  DCHECK(it != button_map_.end());
+  return it->second;
+}
+
+}  // namespace ui