Gestures are now possible using touch events with any ids

ui/aura/gestures/gesture_point.cc

Index: ui/aura/gestures/gesture_point.cc
diff --git a/ui/aura/gestures/gesture_point.cc b/ui/aura/gestures/gesture_point.cc
index be72be1c5c884bd421cbc67aeb4f5f7da88c93fd..656b586b5f52abab6683674cd6276d413dcb3494 100644
--- a/ui/aura/gestures/gesture_point.cc
+++ b/ui/aura/gestures/gesture_point.cc
@@ -27,7 +27,8 @@ GesturePoint::GesturePoint()
     : first_touch_time_(0.0),
       last_touch_time_(0.0),
       last_tap_time_(0.0),
-      velocity_calculator_(kBufferedPoints) {
+      velocity_calculator_(kBufferedPoints),
+      in_use_(false) {
 }
 
 GesturePoint::~GesturePoint() {}
@@ -35,6 +36,7 @@ GesturePoint::~GesturePoint() {}
 void GesturePoint::Reset() {
   first_touch_time_ = last_touch_time_ = 0.0;
   velocity_calculator_.ClearHistory();
+  in_use_ = false;
 }
 
 void GesturePoint::UpdateValues(const TouchEvent& event) {