ozone: evdev: Add a couple more trace events

ui/events/ozone/evdev/event_converter_evdev_impl.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/event_converter_evdev_impl.h"
 
 #include <errno.h>
 #include <linux/input.h>
 
+#include "base/trace_event/trace_event.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
 #include "ui/events/ozone/evdev/device_event_dispatcher_evdev.h"
 #include "ui/events/ozone/evdev/keyboard_util_evdev.h"
 
 namespace ui {
 
 namespace {
 
@@ skipping 26 matching lines @@
       cursor_(cursor),
       dispatcher_(dispatcher) {
 }
 
 EventConverterEvdevImpl::~EventConverterEvdevImpl() {
   Stop();
   close(fd_);
 }
 
 void EventConverterEvdevImpl::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT1("evdev", "EventConverterEvdevImpl::OnFileCanReadWithoutBlocking",
+               "fd", fd);
+
   input_event inputs[4];
   ssize_t read_size = read(fd, inputs, sizeof(inputs));
   if (read_size < 0) {
     if (errno == EINTR || errno == EAGAIN)
       return;
     if (errno != ENODEV)
       PLOG(ERROR) << "error reading device " << path_.value();
     Stop();
     return;
   }
@@ skipping 177 matching lines @@
 
   dispatcher_->DispatchMouseMoveEvent(
       MouseMoveEventParams(input_device_.id, cursor_->GetLocation(),
                            TimeDeltaFromInputEvent(input)));
 
   x_offset_ = 0;
   y_offset_ = 0;
 }
 
 }  // namespace ui