Switch to using an explicit ended signal instead of time comparison.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 617bad3cd641e9a7bf1e4b5b9079f621ea4ba1c1..4ee85e57deba6dc29abc9ccd4c621223a50bd43c 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -2979,7 +2979,7 @@ void HTMLMediaElement::sourceWasRemoved(HTMLSourceElement* source) {
   }
 }
 
-void HTMLMediaElement::timeChanged() {
+void HTMLMediaElement::timeChanged(bool ended) {
   BLINK_MEDIA_LOG << "timeChanged(" << (void*)this << ")";
 
   cueTimeline().updateActiveCues(currentTime());
@@ -2997,14 +2997,7 @@ void HTMLMediaElement::timeChanged() {
   // already posted one at the current movie time.
   scheduleTimeupdateEvent(false);
 
-  double now = currentTime();
-  double dur = duration();
-
-  // When the current playback position reaches the end of the media resource
-  // when the direction of playback is forwards, then the user agent must follow
-  // these steps:
-  if (!std::isnan(dur) && dur && now >= dur &&
-      getDirectionOfPlayback() == Forward) {
+  if (ended) {
     // If the media element has a loop attribute specified
     if (loop()) {
       //  then seek to the earliest possible position of the media resource and