Support text track selection in video controls

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

Index: third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
index 1762f9dea61458c285cff8d6d3561930dc94bcdf..d1ca41a9b542249e861053d60cd49d632c115305 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
@@ -34,6 +34,8 @@
 
 namespace blink {
 
+class TextTrack;
+
 // ----------------------------
 
 class MediaControlPanelElement final : public MediaControlDivElement {
@@ -146,6 +148,29 @@ private:
 
 // ----------------------------
 
+class MediaControlTextTrackListElement final : public MediaControlDivElement {
+public:
+    static PassRefPtrWillBeRawPtr<MediaControlTextTrackListElement> create(MediaControls&);
+
+    bool willRespondToMouseClickEvents() override { return true; }
+
+    void refreshTextTrackListMenu();
+    void displayTextTrackList(bool);
+
+private:
+    explicit MediaControlTextTrackListElement(MediaControls&);
+
+    void defaultEventHandler(Event*) override;
+
+    String getTextTrackLabel(TextTrack*);
+    PassRefPtrWillBeRawPtr<Element> createTextTrackListItem(TextTrack*);
+
+    void showTextTrackAtIndex(unsigned);
+    void disableShowingTextTracks();
+};
+
+// ----------------------------
+
 class MediaControlTimelineElement final : public MediaControlInputElement {
 public:
     static PassRefPtrWillBeRawPtr<MediaControlTimelineElement> create(MediaControls&);