Support text track selection in video controls

Source/core/html/track/TextTrack.cpp

Index: Source/core/html/track/TextTrack.cpp
diff --git a/Source/core/html/track/TextTrack.cpp b/Source/core/html/track/TextTrack.cpp
index 3916eb7159ac8f3b29f831a64debde7c48ff5597..e87191fa7bcf03bd720931d2c6c26353efbc52dd 100644
--- a/Source/core/html/track/TextTrack.cpp
+++ b/Source/core/html/track/TextTrack.cpp
@@ -458,6 +458,14 @@ int TextTrack::trackIndexRelativeToRenderedTracks()
     return m_renderedTrackIndex;
 }
 
+bool TextTrack::isRenderable()
+{
+    // A track can be displayed when it's of kind captions or subtitles and hasn't failed to load
+    if ((kind() == captionsKeyword() || kind() == subtitlesKeyword()) && readinessState() != FailedToLoad)
+        return true;
+    return false;
+}
+
 const AtomicString& TextTrack::interfaceName() const
 {
     return EventTargetNames::TextTrack;