ozone: evdev: Add libgestures bindings for touchpad & mouse support

ui/events/ozone/evdev/libgestures_glue/gesture_logging.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/libgestures_glue/gesture_logging.h"
+
+#include <gestures/gestures.h>
+#include <stdarg.h>
+
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
+
+namespace {
+
+std::string FormatLog(const char* fmt, va_list args) {
+  std::string msg = base::StringPrintV(fmt, args);
+  if (!msg.empty() && msg[msg.size() - 1] == '\n')
+    msg.erase(msg.end() - 1, msg.end());
+  return msg;
+}
+
+}  // namespace
+
+void gestures_log(int verb, const char* fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+  if (verb <= GESTURES_LOG_ERROR)
+    LOG(ERROR) << "gestures: " << FormatLog(fmt, args);
+  else if (verb <= GESTURES_LOG_INFO)
+    VLOG(3) << "gestures: " << FormatLog(fmt, args);
+  va_end(args);
+}