Support text track selection in video controls

third_party/WebKit/Source/core/css/mediaControls.css

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 }
 
 audio::-webkit-media-controls,
 video::-webkit-media-controls {
     width: inherit;
     height: inherit;
     position: relative;
     direction: ltr;
     display: flex;
     flex-direction: column;
+    font-family: Arial, Helvetica, sans-serif;
     justify-content: flex-end;
     align-items: center;
 }
 
 audio::-webkit-media-controls-enclosure, video::-webkit-media-controls-enclosure {
     width: 100%;
     max-width: 800px;
     height: 30px;
     flex-shrink: 0;
     bottom: 0;
@@ skipping 149 matching lines @@
     flex: none;
     display: flex;
     border: none;
     cursor: default;
 
     height: 30px;
     margin: 0 9px 0 0;
     padding: 0;
 
     line-height: 30px;
-    font-family: Arial, Helvetica, sans-serif;
     font-size: 13px;
     font-weight: bold;
     font-style: normal;
     color: white;
 
     letter-spacing: normal;
     word-spacing: normal;
     text-transform: none;
     text-indent: 0;
     text-shadow: none;
@@ skipping 113 matching lines @@
 }
 
 audio::-webkit-media-controls-fullscreen-volume-min-button, video::-webkit-media-controls-fullscreen-volume-min-button {
     display: none;
 }
 
 audio::-webkit-media-controls-fullscreen-volume-max-button, video::-webkit-media-controls-fullscreen-volume-max-button {
     display: none;
 }
 
+video::-webkit-scrollbar {

[philipj_slow, 2016/03/01 13:01:15]

It's a bit weird that this pseudo-element is on the video element itself, but I
guess it doesn't work to do
video::-internal-media-controls-text-track-list::-webkit-scrollbar?

[srivats, 2016/03/30 00:46:42]

Unfortunately not. I tried doing that before having to resort to doing it this
way.

+    width: 12px;
+}
+
+video::-webkit-scrollbar-track {
+    box-shadow: inset 0 0 6px rgba(20, 20, 20, 0.3);
+    border-radius: 10px;
+}
+
+video::-webkit-scrollbar-thumb {
+    border-radius: 10px;
+    background-color: rgba(80, 80, 80, 0.8);
+    box-shadow: inset 0 0 6px rgba(20, 20, 20, 0.5);
+}
+
+video::-internal-media-controls-text-track-list {
+    position: absolute;
+    bottom: 35px;
+    right: 5px;
+    background: rgba(20, 20, 20, 0.8);
+    max-width: 50%;
+    max-height: 250px;
+    border-radius: 5px;
+    overflow-x: hidden;
+    overflow-y: auto;
+    text-overflow: ellipsis;
+    margin-bottom: 5px;
+    white-space: nowrap;
+    padding: 10px;
+    font-weight: bold;
+    font-size: 13px;
+}
+
+video::-internal-media-controls-text-track-list-item {
+    display: block;
+    color: white;
+    padding: 4px 30px 4px 10px;
+    border-bottom: 1px solid #555;
+    text-align: start;
+    line-height: 25px;
+}
+
+video::-internal-media-controls-text-track-list-item:hover {
+    background-color: rgba(105, 105, 105, 0.8);
+}
+
+video::-internal-media-controls-text-track-list-item-input {
+    -webkit-appearance: -internal-media-track-selection-checkmark;
+    position: relative;
+    visibility: hidden;
+    top: -2px;
+    left: 0;
+    vertical-align: middle;
+    margin: 0 5px 0 0;
+    width: 25px;
+    height: 25px;
+}
+
+video::-internal-media-controls-text-track-list-item-input:checked {
+    visibility: visible;
+}
+
+video::-internal-media-controls-text-track-list-kind-captions {
+    -webkit-appearance: -internal-media-closed-captions-icon;
+    height: 24px;
+    width: 24px;
+    margin-left: 10px;
+    vertical-align: middle;
+}
+
+video::-internal-media-controls-text-track-list-kind-subtitles {
+    -webkit-appearance: -internal-media-subtitles-icon;
+    height: 20px;
+    width: 20px;
+    margin-left: 10px;
+    vertical-align: middle;
+}
+
 video::-webkit-media-text-track-container {
     position: relative;
     width: inherit;
     height: inherit;
     overflow: hidden;
 
     font: 22px sans-serif;
     text-align: center;
     color: rgba(255, 255, 255, 1);
 
@@ skipping 54 matching lines @@
     font-weight: bold;
 }
 
 video::cue(u) {
     text-decoration: underline;
 }
 
 video::cue(i) {
     font-style: italic;
 }