Reland of [Ozone] Properly initialize multitouch slot values

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 54 matching lines @@
 }
 
 float TuxelToPixelSize(float val, float num_tuxels, float num_pixels) {
   return val * num_pixels / num_tuxels;
 }
 
 }  // namespace
 
 namespace ui {
 
+TouchEventConverterEvdev::InProgressEvents::InProgressEvents()
+    : x_(0),
+      y_(0),
+      id_(-1),
+      finger_(-1),
+      type_(ET_UNKNOWN),
+      radius_x_(0),
+      radius_y_(0),
+      pressure_(0) {
+}
+
 TouchEventConverterEvdev::TouchEventConverterEvdev(
     int fd,
     base::FilePath path,
     int id,
     const EventDeviceInfo& info,
     const EventDispatchCallback& callback)
     : EventConverterEvdev(fd, path, id),
       callback_(callback),
       syn_dropped_(false),
       is_type_a_(false),
@@ skipping 37 matching lines @@
   x_num_tuxels_ -= cal.bezel_left + cal.bezel_right;
   y_min_tuxels_ += cal.bezel_top;
   y_num_tuxels_ -= cal.bezel_top + cal.bezel_bottom;
 
   VLOG(1) << "applying touch calibration: "
           << base::StringPrintf("[%d, %d, %d, %d]",
                                 cal.bezel_left,
                                 cal.bezel_right,
                                 cal.bezel_top,
                                 cal.bezel_bottom);
+
+  for (int i = 0;
+       i < std::min<int>(info.GetAbsMaximum(ABS_MT_SLOT) + 1, MAX_FINGERS);
+       ++i) {
+    events_[i].finger_ = info.GetSlotValue(ABS_MT_TRACKING_ID, i);
+    events_[i].type_ =
+        events_[i].finger_ < 0 ? ET_TOUCH_RELEASED : ET_TOUCH_PRESSED;
+    events_[i].x_ = info.GetSlotValue(ABS_MT_POSITION_X, i);
+    events_[i].y_ = info.GetSlotValue(ABS_MT_POSITION_Y, i);
+    events_[i].radius_x_ = info.GetSlotValue(ABS_MT_TOUCH_MAJOR, i);
+    events_[i].radius_y_ = info.GetSlotValue(ABS_MT_TOUCH_MINOR, i);
+    events_[i].pressure_ = info.GetSlotValue(ABS_MT_PRESSURE, i);
+  }
 }
 
 bool TouchEventConverterEvdev::Reinitialize() {
   EventDeviceInfo info;
   if (info.Initialize(fd_)) {
     Init(info);
     return true;
   }
   return false;
 }
@@ skipping 151 matching lines @@
 
       // Subsequent events for this finger will be touch-move until it
       // is released.
       events_[i].type_ = ET_TOUCH_MOVED;
     }
   }
   altered_slots_.reset();
 }
 
 }  // namespace ui