Expose native, desktop and mobile gesture detection defaults

ui/events/gesture_detection/filtered_gesture_provider.cc

Index: ui/events/gesture_detection/filtered_gesture_provider.cc
diff --git a/ui/events/gesture_detection/filtered_gesture_provider.cc b/ui/events/gesture_detection/filtered_gesture_provider.cc
index 76ee5201d1adae15f650074a1ce9956e588d494c..55f4fad1f29a2254b7c374336e18e73c4b3871b5 100644
--- a/ui/events/gesture_detection/filtered_gesture_provider.cc
+++ b/ui/events/gesture_detection/filtered_gesture_provider.cc
@@ -16,14 +16,16 @@ FilteredGestureProvider::FilteredGestureProvider(
     : client_(client),
       gesture_provider_(config, this),
       gesture_filter_(this),
-      handling_event_(false) {}
+      handling_event_(false),
+      last_touch_event_did_generate_scroll_(false) {
+}
 
 bool FilteredGestureProvider::OnTouchEvent(const MotionEvent& event) {
   DCHECK(!handling_event_);
   base::AutoReset<bool> handling_event(&handling_event_, true);
 
   pending_gesture_packet_ = GestureEventDataPacket::FromTouch(event);
-
+  last_touch_event_did_generate_scroll_ = false;
   if (!gesture_provider_.OnTouchEvent(event))
     return false;
 
@@ -59,8 +61,16 @@ const ui::MotionEvent* FilteredGestureProvider::GetCurrentDownEvent() const {
   return gesture_provider_.current_down_event();
 }
 
+bool FilteredGestureProvider::LastTouchEventDidGenerateScroll() const {
+  return last_touch_event_did_generate_scroll_;
+}
+
 void FilteredGestureProvider::OnGestureEvent(const GestureEventData& event) {
   if (handling_event_) {
+    if (event.details.type() == ui::ET_GESTURE_SCROLL_BEGIN ||
+        event.details.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
+      last_touch_event_did_generate_scroll_ = true;
+    }
     pending_gesture_packet_.Push(event);
     return;
   }