Reject play promises when the playback reaches the end.

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

 /*
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  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
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@@ skipping 2895 matching lines @@
         if (loop()) {
             //  then seek to the earliest possible position of the media resource and abort these steps.
             seek(0);
         } else {
             // If the media element has still ended playback, and the direction of playback is still
             // forwards, and paused is false,
             if (!m_paused) {
                 // changes paused to true and fires a simple event named pause at the media element.
                 m_paused = true;
                 scheduleEvent(EventTypeNames::pause);
+                scheduleRejectPlayPromises(AbortError);

[foolip, 2016/08/18 20:16:17]

Add a TODO to add event firing and rejection in the same task? Maybe you have an
umbrella bug for these GenericEventQueue vs. other tasks already.

[mlamouri (slow - plz ping), 2016/08/19 09:26:29]

It is bug 587871. Given that we never bundle promises and events in one task, I
don't think adding TODO all over the code would make much sense and adding TODO
in some places and not other would be strange.

             }
             // Queue a task to fire a simple event named ended at the media element.
             scheduleEvent(EventTypeNames::ended);
         }
     }
     updatePlayState();
 }
 
 void HTMLMediaElement::durationChanged()
 {
@@ skipping 1114 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect() const
 {
     IntRect result;
     if (LayoutObject* object = m_element->layoutObject())
         result = object->absoluteBoundingBoxRect();
     return result;
 }
 
 } // namespace blink