Eager Gesture Recognition on Aura

ui/events/gestures/gesture_provider_aura.cc

Index: ui/events/gestures/gesture_provider_aura.cc
diff --git a/ui/events/gestures/gesture_provider_aura.cc b/ui/events/gestures/gesture_provider_aura.cc
index 079884e3906de19ada82550638cdb830d5eb83ae..30200f93298763a0377919c2ce499bad8e0e4ee5 100644
--- a/ui/events/gestures/gesture_provider_aura.cc
+++ b/ui/events/gestures/gesture_provider_aura.cc
@@ -23,8 +23,8 @@ GestureProviderAura::GestureProviderAura(GestureProviderAuraClient* client)
 GestureProviderAura::~GestureProviderAura() {}
 
 bool GestureProviderAura::OnTouchEvent(const TouchEvent& event) {
-  bool pointer_id_is_active =
-      pointer_state_.FindPointerIndexOfId(event.touch_id()) != -1;
+  int index = pointer_state_.FindPointerIndexOfId(event.touch_id());
+  bool pointer_id_is_active = index != -1;
 
   if (event.type() == ET_TOUCH_PRESSED && pointer_id_is_active) {
     // Ignore touch press events if we already believe the pointer is down.
@@ -36,6 +36,14 @@ bool GestureProviderAura::OnTouchEvent(const TouchEvent& event) {
     return false;
   }
 
+  // If this is a touchmove event, and it isn't different from the last
+  // event, ignore it.
+  if (event.type() == ET_TOUCH_MOVED &&
+      event.x() == pointer_state_.GetX(index) &&
+      event.y() == pointer_state_.GetY(index)) {
+    return false;
+  }
+
   last_touch_event_flags_ = event.flags();
   last_touch_event_latency_info_ = *event.latency();
   pointer_state_.OnTouch(event);