setValueCurve can start at the end of other automations

Source/modules/webaudio/AudioParamTimeline.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 175 matching lines @@
     if (!isValid)
         return;
 
     MutexLocker locker(m_eventsLock);
 
     unsigned i = 0;
     double insertTime = event.time();
 
     for (i = 0; i < m_events.size(); ++i) {
         if (event.type() == ParamEvent::SetValueCurve) {
-            // If this event is a SetValueCurve, make sure it doesn't overlap any existing event.
+            // If this event is a SetValueCurve, make sure it doesn't overlap any existing
+            // event. It's ok if the SetValueCurve starts at the same time as the end of some other
+            // duration.
             double endTime = event.time() + event.duration();
-            if (m_events[i].time() >= event.time() && m_events[i].time() < endTime) {
+            if (m_events[i].time() > event.time() && m_events[i].time() < endTime) {
                 exceptionState.throwDOMException(
                     NotSupportedError,
                     eventToString(event) + " overlaps " + eventToString(m_events[i]));
                 return;
             }
         } else {
             // Otherwise, make sure this event doesn't overlap any existing SetValueCurve event.
             if (m_events[i].type() == ParamEvent::SetValueCurve) {
                 double endTime = m_events[i].time() + m_events[i].duration();
                 if (event.time() >= m_events[i].time() && event.time() < endTime) {
@@ skipping 352 matching lines @@
     // to the end of the values buffer.
     for (; writeIndex < numberOfValues; ++writeIndex)
         values[writeIndex] = value;
 
     return value;
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)