Support text track selection in video controls

Source/core/layout/LayoutMediaControls.cpp

Index: Source/core/layout/LayoutMediaControls.cpp
diff --git a/Source/core/layout/LayoutMediaControls.cpp b/Source/core/layout/LayoutMediaControls.cpp
index f969a22290ffcd206d4f22ceed5935cbcd1a464a..c65576e328015aca1cad7d6f25111aee3bf79471 100644
--- a/Source/core/layout/LayoutMediaControls.cpp
+++ b/Source/core/layout/LayoutMediaControls.cpp
@@ -375,6 +375,16 @@ static bool paintMediaCastButton(LayoutObject* object, const PaintInfo& paintInf
     }
 }
 
+static bool paintMediaTrackSelectionCheckmark(LayoutObject* object, const PaintInfo& paintInfo, const IntRect& rect)
+{
+    HTMLMediaElement* mediaElement = toParentMediaElement(object);
+    if (!mediaElement)
+        return false;
+
+    static Image* mediaTrackSelectionCheckmark = platformResource("mediaplayerTrackSelectionCheckmark");
+    return paintMediaButton(paintInfo.context, rect, mediaTrackSelectionCheckmark);
+}
+
 bool LayoutMediaControls::paintMediaControlsPart(MediaControlElementType part, LayoutObject* object, const PaintInfo& paintInfo, const IntRect& rect)
 {
     switch (part) {
@@ -404,12 +414,15 @@ bool LayoutMediaControls::paintMediaControlsPart(MediaControlElementType part, L
     case MediaOverlayCastOffButton:
     case MediaOverlayCastOnButton:
         return paintMediaCastButton(object, paintInfo, rect);
+    case MediaTrackSelectionCheckmark:
+        return paintMediaTrackSelectionCheckmark(object, paintInfo, rect);
     case MediaVolumeSliderContainer:
     case MediaTimelineContainer:
     case MediaCurrentTimeDisplay:
     case MediaTimeRemainingDisplay:
     case MediaControlsPanel:
     case MediaHideClosedCaptionsButton:
+    case MediaTextTrackList:
     case MediaFullScreenVolumeSlider:
     case MediaFullScreenVolumeSliderThumb:
         ASSERT_NOT_REACHED();