Adding functionality to paint and signal buffer swap for ozone surface factory.

ui/base/ozone/event_factory_ozone.cc

 // Copyright (c) 2013 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/base/ozone/event_factory_ozone.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <poll.h>
 #include <unistd.h>
 
 #include "base/message_loop/message_pump_ozone.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "ui/base/ozone/evdev/key_event_converter_ozone.h"
 #include "ui/base/ozone/evdev/touch_event_converter_ozone.h"
@@ skipping 21 matching lines @@
   // If there is no |delegate_| set, read events from /dev/input/*
 
   // The number of devices in the directory is unknown without reading
   // the contents of the directory. Further, with hot-plugging,  the entries
   // might decrease during the execution of this loop. So exciting from the
   // loop on the first failure of open below is both cheaper and more
   // reliable.
   for (int id = 0; true; id++) {
     std::string path = base::StringPrintf("/dev/input/event%d", id);
     int fd = open(path.c_str(), O_RDONLY | O_NONBLOCK);
-    if (fd < 0)
+    if (fd < 0) {
+      DLOG(ERROR) << "Cannot open '" << path << "': " << strerror(errno);
       break;
+    }
     size_t evtype = 0;
     COMPILE_ASSERT(sizeof(evtype) * 8 >= EV_MAX, evtype_wide_enough);
     if (ioctl(fd, EVIOCGBIT(0, sizeof(evtype)), &evtype) == -1) {
       DLOG(ERROR) << "failed ioctl EVIOCGBIT 0" << path;
       close(fd);
       continue;
     }
 
     scoped_ptr<EventConverterOzone> converter;
     // TODO(rjkroege) Add more device types. Support hot-plugging.
@@ skipping 37 matching lines @@
 
 void EventFactoryOzone::RemoveEventConverter(int fd) {
   // Always delete watchers before converters to prevent a possible race.
   delete watchers_[fd];
   delete converters_[fd];
   watchers_.erase(fd);
   converters_.erase(fd);
 }
 
 }  // namespace ui