Fix a bug that could occasionaly cause setInterval to stop

third_party/WebKit/Source/platform/Timer.cpp

Index: third_party/WebKit/Source/platform/Timer.cpp
diff --git a/third_party/WebKit/Source/platform/Timer.cpp b/third_party/WebKit/Source/platform/Timer.cpp
index 14ee907247ac45fc3ef7835e73de28cb590fddbc..61d8556e6e62f58ca6ab21333aac9fb52cded6e5 100644
--- a/third_party/WebKit/Source/platform/Timer.cpp
+++ b/third_party/WebKit/Source/platform/Timer.cpp
@@ -97,17 +97,13 @@ void TimerBase::setNextFireTime(double now, double delay)
 {
     ASSERT(m_thread == currentThread());
 
-    double newTime = now + delay;
-
-    if (m_nextFireTime != newTime) {
-        m_nextFireTime = newTime;
-        if (m_cancellableTimerTask)
-            m_cancellableTimerTask->cancel();
-        m_cancellableTimerTask = new CancellableTimerTask(this);
+    m_nextFireTime = now + delay;
+    if (m_cancellableTimerTask)
+        m_cancellableTimerTask->cancel();
+    m_cancellableTimerTask = new CancellableTimerTask(this);
 
-        double delayMs = 1000.0 * (newTime - now);
-        timerTaskRunner()->postDelayedTask(m_location, m_cancellableTimerTask, delayMs);
-    }
+    double delayMs = 1000.0 * delay;
+    timerTaskRunner()->postDelayedTask(m_location, m_cancellableTimerTask, delayMs);
 }
 
 NO_LAZY_SWEEP_SANITIZE_ADDRESS
@@ -129,7 +125,7 @@ void TimerBase::runInternal()
         // called slightly before m_unalignedNextFireTime, which can happen due to lack
         // of timer precision.
         double intervalToNextFireTime = m_repeatInterval - fmod(now - m_nextFireTime, m_repeatInterval);
-        setNextFireTime(timerMonotonicallyIncreasingTime(), intervalToNextFireTime);
+        setNextFireTime(now, intervalToNextFireTime);
     } else {
         m_nextFireTime = 0;
     }