ozone: Selectively enable touch debug buffer

ui/events/ozone/evdev/touch_event_converter_evdev.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/ozone/evdev/touch_event_converter_evdev.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <poll.h>
@@ skipping 284 matching lines @@
   touch_logging_enabled_ = enabled;
 }
 
 void TouchEventConverterEvdev::SetPalmSuppressionCallback(
     const base::Callback<void(bool)>& callback) {
   enable_palm_suppression_callback_ = callback;
 }
 
 void TouchEventConverterEvdev::ProcessMultitouchEvent(
     const input_event& input) {
-  if (touch_logging_enabled_)
+  if (touch_logging_enabled_ && !has_pen_)
     touch_evdev_debug_buffer_.ProcessEvent(current_slot_, &input);
 
   if (input.type == EV_SYN) {
     ProcessSyn(input);
   } else if (dropped_events_) {
     // Do nothing. This branch indicates we have lost sync with the driver.
   } else if (input.type == EV_ABS) {
     if (events_.size() <= current_slot_) {
       LOG(ERROR) << "current_slot_ (" << current_slot_
                  << ") >= events_.size() (" << events_.size() << ")";
@@ skipping 271 matching lines @@
   if (pressure_max_ - pressure_min_)
     pressure /= pressure_max_ - pressure_min_;
   return pressure;
 }
 
 int TouchEventConverterEvdev::NextTrackingId() {
   return next_tracking_id_++ & kMaxTrackingId;
 }
 
 }  // namespace ui