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..f4ea79e94569e273484615544791d71d1456f8c8 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 +148,30 @@ private:
 
 // ----------------------------
 
+class MediaControlTextTrackListElement final : public MediaControlDivElement {
+public:
+    static PassRefPtrWillBeRawPtr<MediaControlTextTrackListElement> create(MediaControls&);
+
+    bool willRespondToMouseClickEvents() override { return true; }
+
+    void changeVisibility(bool);

[philipj_slow, 2016/03/01 13:01:16]

The meaning of this bool argument isn't obvious, and is the opposite of what I
would guess. Just show() and hide() would be OK, or setVisible(bool) with the
opposite meaning compared to now would work if you think the if (x) { show(); }
else { hide(); } is going to be ugly.

[srivats, 2016/03/30 00:46:43]

Changed it to setVisible. I can change it to hide and show if this still doesn't
work.

+
+private:
+    explicit MediaControlTextTrackListElement(MediaControls&);
+
+    void defaultEventHandler(Event*) override;
+
+    void refreshTextTrackListMenu();
+
+    String getTextTrackLabel(TextTrack*);

[philipj_slow, 2016/03/01 13:01:16]

Can you document here and below that null is allowed and what it means?

[srivats, 2016/03/30 00:46:43]

Done.

+    PassRefPtrWillBeRawPtr<Element> createTextTrackListItem(TextTrack*);
+
+    void showTextTrackAtIndex(unsigned);
+    void disableShowingTextTracks();
+};
+
+// ----------------------------
+
 class MediaControlTimelineElement final : public MediaControlInputElement {
 public:
     static PassRefPtrWillBeRawPtr<MediaControlTimelineElement> create(MediaControls&);