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

content/renderer/media/android/webmediaplayer_android.cc

Index: content/renderer/media/android/webmediaplayer_android.cc
diff --git a/content/renderer/media/android/webmediaplayer_android.cc b/content/renderer/media/android/webmediaplayer_android.cc
index 14c38d01cd05223037552f48b314f69b6b375922..dfc8c2bb7c32f1e315551e88897fff222c03a09e 100644
--- a/content/renderer/media/android/webmediaplayer_android.cc
+++ b/content/renderer/media/android/webmediaplayer_android.cc
@@ -716,7 +716,7 @@ void WebMediaPlayerAndroid::OnPlaybackComplete() {
   // know that the playback has finished. To solve this, we set the
   // current time to media duration when OnPlaybackComplete() get called.
   interpolator_.SetBounds(duration_, duration_, default_tick_clock_.NowTicks());
-  client_->timeChanged();
+  client_->timeChanged(true);
 
   // If the loop attribute is set, timeChanged() will update the current time
   // to 0. It will perform a seek to 0. Issue a command to the player to start
@@ -757,7 +757,7 @@ void WebMediaPlayerAndroid::OnSeekComplete(
 
   UpdateReadyState(WebMediaPlayer::ReadyStateHaveEnoughData);
 
-  client_->timeChanged();
+  client_->timeChanged(playback_completed_);
 }
 
 void WebMediaPlayerAndroid::OnMediaError(int error_type) {