Fix uninitialized timestamps being passed to the gesture lib

ui/events/ozone/evdev/libgestures_glue/gesture_timer_provider.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_timer_provider.h"
 
 #include <gestures/gestures.h>
 
 #include "base/timer/timer.h"
 
@@ skipping 11 matching lines @@
                      delay * base::Time::kMicrosecondsPerSecond),
                  this,
                  &GesturesTimer::OnTimerExpired);
   }
 
   void Cancel() { timer_.Stop(); }
 
  private:
   void OnTimerExpired() {
     struct timespec ts;
-    DCHECK(!clock_gettime(CLOCK_MONOTONIC, &ts));
+    int fail = clock_gettime(CLOCK_MONOTONIC, &ts);
+    DCHECK(!fail);
+
+    // Run the callback and reschedule the next run if requested.
     stime_t next_delay = callback_(StimeFromTimespec(&ts), callback_data_);
     if (next_delay >= 0) {
       timer_.Start(FROM_HERE,
                    base::TimeDelta::FromMicroseconds(
                        next_delay * base::Time::kMicrosecondsPerSecond),
                    this,
                    &GesturesTimer::OnTimerExpired);
     }
   }
 
@@ skipping 20 matching lines @@
 
 void GesturesTimerFree(void* data, GesturesTimer* timer) { delete timer; }
 
 }  // namespace
 
 const GesturesTimerProvider kGestureTimerProvider = {
     GesturesTimerCreate, GesturesTimerSet, GesturesTimerCancel,
     GesturesTimerFree};
 
 }  // namespace ui