ozone: evdev: Add a couple more trace events

Add trace event inside each read notification for evdev.

BUG=none
TEST=chrome://tracing in link_freon

Review URL: https://codereview.chromium.org/1110693003

Cr-Commit-Position: refs/heads/master@{#327110}

ui/events/ozone/evdev/event_converter_evdev_impl.cc

@@ -7,6 +7,7 @@
 #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"
@@ -53,6 +54,9 @@ EventConverterEvdevImpl::~EventConverterEvdevImpl() {
 }
 
 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) {

ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.cc

@@ -11,6 +11,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event.h"
 
 namespace ui {
 
@@ -70,6 +71,9 @@ EventReaderLibevdevCros::~EventReaderLibevdevCros() {
 EventReaderLibevdevCros::Delegate::~Delegate() {}
 
 void EventReaderLibevdevCros::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT1("evdev", "EventReaderLibevdevCros::OnFileCanReadWithoutBlocking",
+               "fd", fd);
+
   if (EvdevRead(&evdev_)) {
     if (errno == EINTR || errno == EAGAIN)
       return;

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) {

ui/events/ozone/evdev/touch_event_converter_evdev.cc

@@ -23,6 +23,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/devices/device_util_linux.h"
 #include "ui/events/event.h"
@@ -214,6 +215,10 @@ void TouchEventConverterEvdev::OnStopped() {
 }
 
 void TouchEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT1("evdev",
+               "TouchEventConverterEvdev::OnFileCanReadWithoutBlocking", "fd",
+               fd);
+
   input_event inputs[kNumTouchEvdevSlots * 6 + 1];
   ssize_t read_size = read(fd, inputs, sizeof(inputs));
   if (read_size < 0) {