Port of Android platform gesture detection code to C++

ui/events/gesture_detection/gesture_config_helper.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/gesture_detection/gesture_config_helper.h"
+
+namespace ui {
+
+GestureDetector::Config DefaultGestureDetectorConfig() {
+  return GestureDetector::Config();
+}
+
+ScaleGestureDetector::Config DefaultScaleGestureDetectorConfig() {
+  return ScaleGestureDetector::Config();
+}
+
+SnapScrollController::Config DefaultSnapScrollControllerConfig() {
+  return SnapScrollController::Config();
+}
+
+GestureProvider::Config DefaultGestureProviderConfig() {
+  return GestureProvider::Config();
+}
+
+}  // namespace ui