[Video] Fix DCHECK crash in PauseVideoIfHidden

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index 3ed41a3be186b1b824e04c158398018e35b974ea..84b9fd6a05ddaaaeb24c81a246ee601697eb3c94 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -1405,11 +1405,13 @@ void WebMediaPlayerImpl::OnFrameHidden() {
   if (watch_time_reporter_)
     watch_time_reporter_->OnHidden();
 
-  if (ShouldPauseVideoWhenHidden()) {
-    PauseVideoIfNeeded();
-    return;
-  } else {
-    DisableVideoTrackIfNeeded();
+  if (!delegate_->IsFrameClosed()) {

[sandersd (OOO until July 31), 2017/01/24 19:51:21]

Perhaps just call IsHidden()?

Also, rename IsHidden() to IsBackgrounded() to reduce confusion?

+    if (ShouldPauseVideoWhenHidden()) {
+      PauseVideoIfNeeded();
+      return;
+    } else {
+      DisableVideoTrackIfNeeded();
+    }
   }
 
   UpdatePlayState();