Add multi-finger swipe detection to GestureDetector

ui/events/gesture_detection/gesture_config_helper_aura.cc

Index: ui/events/gesture_detection/gesture_config_helper_aura.cc
diff --git a/ui/events/gesture_detection/gesture_config_helper_aura.cc b/ui/events/gesture_detection/gesture_config_helper_aura.cc
index e7845ac621e5a53121b34d157a5be1b06956f809..420b7fa983f7f057c84132f57ea444786a354e54 100644
--- a/ui/events/gesture_detection/gesture_config_helper_aura.cc
+++ b/ui/events/gesture_detection/gesture_config_helper_aura.cc
@@ -27,6 +27,10 @@ GestureDetector::Config DefaultGestureDetectorConfig() {
       GestureConfiguration::min_scroll_velocity();
   config.maximum_fling_velocity =
       GestureConfiguration::fling_velocity_cap();
+  config.swipe_enabled = true;
+  config.minimum_swipe_velocity = GestureConfiguration::min_swipe_speed();
+  config.maximum_swipe_deviation_angle =
+      atan2(1.f, GestureConfiguration::max_swipe_deviation_ratio());
 
   return config;
 }