Support text track selection in video controls

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 299905f7c3714f256eb3b03a50adc27a9ba2b08b..8e3867c081e406ea2f6cffeafb397082243ac060 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -363,6 +363,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
     , m_audioTracks(AudioTrackList::create(*this))
     , m_videoTracks(VideoTrackList::create(*this))
     , m_textTracks(nullptr)
+    , m_performAutomaticTextTrackSelection(true)
 #if ENABLE(WEB_AUDIO)
     , m_audioSourceNode(nullptr)
 #endif
@@ -1167,6 +1168,11 @@ void HTMLMediaElement::textTrackModeChanged(TextTrack* track)
     textTracks()->scheduleChangeEvent();
 }
 
+void HTMLMediaElement::setAutomaticTextTrackSelection(bool enabled)
+{
+    m_performAutomaticTextTrackSelection = enabled;
+}
+
 bool HTMLMediaElement::isSafeToLoadURL(const KURL& url, InvalidURLAction actionIfInvalid)
 {
     if (!url.isValid()) {
@@ -2481,6 +2487,9 @@ void HTMLMediaElement::honorUserPreferencesForAutomaticTextTrackSelection()
     if (!m_textTracks || !m_textTracks->length())
         return;
 
+    if (!m_performAutomaticTextTrackSelection)
+        return;
+
     AutomaticTrackSelection::Configuration configuration;
     if (m_processingPreferenceChange)
         configuration.disableCurrentlyEnabledTracks = true;