ozone: evdev: Add a couple more trace events

ui/events/ozone/evdev/tablet_event_converter_evdev.cc

Index: ui/events/ozone/evdev/tablet_event_converter_evdev.cc
diff --git a/ui/events/ozone/evdev/tablet_event_converter_evdev.cc b/ui/events/ozone/evdev/tablet_event_converter_evdev.cc
index 3c265e0ec22ed2956309272bb9d90d711533dd0f..22e76ec4f955a875de5be2b433e07eb09c2ec6c6 100644
--- a/ui/events/ozone/evdev/tablet_event_converter_evdev.cc
+++ b/ui/events/ozone/evdev/tablet_event_converter_evdev.cc
@@ -8,6 +8,7 @@
 #include <linux/input.h>
 
 #include "base/message_loop/message_loop.h"
+#include "base/trace_event/trace_event.h"
 #include "ui/events/event.h"
 #include "ui/events/ozone/evdev/device_event_dispatcher_evdev.h"
 
@@ -44,6 +45,10 @@ TabletEventConverterEvdev::~TabletEventConverterEvdev() {
 }
 
 void TabletEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT1("evdev",
+               "TabletEventConverterEvdev::OnFileCanReadWithoutBlocking", "fd",
+               fd);
+
   input_event inputs[4];
   ssize_t read_size = read(fd, inputs, sizeof(inputs));
   if (read_size < 0) {