Support text track selection in video controls

third_party/WebKit/public/blink_image_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/blink_image_resources.h" type="rc_header" context="default_100_percent">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="blink_image_resources_100_percent.pak" type="data_package" context="default_100_percent" />
     <output filename="blink_image_resources_200_percent.pak" type="data_package" context="default_200_percent" />
   </outputs>
   <release seq="1">
@@ skipping 26 matching lines @@
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_EXIT_FULLSCREEN_BUTTON" file="blink/mediaplayer_exit_fullscreen.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CAST_BUTTON_OFF" file="blink/mediaplayer_cast_off.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CAST_BUTTON_OFF_NEW" file="blink/mediaplayer_cast_off_new.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CAST_BUTTON_ON" file="blink/mediaplayer_cast_on.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CAST_BUTTON_ON_NEW" file="blink/mediaplayer_cast_on_new.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_OVERLAY_CAST_BUTTON_OFF" file="blink/mediaplayer_overlay_cast_off.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_OVERLAY_CAST_BUTTON_OFF_NEW" file="blink/mediaplayer_overlay_cast_off_new.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_OVERLAY_CAST_BUTTON_ON_NEW" file="blink/mediaplayer_overlay_cast_on_new.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_OVERLAY_PLAY_BUTTON" file="blink/mediaplayer_overlay_play.png" />
       <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_OVERLAY_PLAY_BUTTON_NEW" file="blink/mediaplayer_overlay_play_new.png" />
+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_TRACKSELECTION_CHECKMARK" file="blink/mediaplayer_trackselection_checkmark.png" />
+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_TRACKSELECTION_CHECKMARK_NEW" file="blink/mediaplayer_trackselection_checkmark_new.png" />

[fs, 2016/02/24 10:14:57]

Do we still need to have both "old" and "new" resources? Couldn't we clean that
up now? If not, maybe just gate this on the "new UI" being enabled?

[srivats, 2016/02/25 21:47:56]

Looks like all other icons have assets for both new UI and the old one and have
been defined the same way.
The new UI is enabled only on some platforms like Android AFAICT.

[fs, 2016/02/25 22:06:48]

Right, I see it's disabled by default. This is fine then I suppose.

+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CLOSEDCAPTIONS_ICON" file="blink/mediaplayer_closedcaptions_icon.png" />
+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_CLOSEDCAPTIONS_ICON_NEW" file="blink/mediaplayer_closedcaptions_icon_new.png" />
+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_SUBTITLES_ICON" file="blink/mediaplayer_subtitles_icon.png" />
+      <structure type="chrome_scaled_image" name="IDR_MEDIAPLAYER_SUBTITLES_ICON_NEW" file="blink/mediaplayer_subtitles_icon_new.png" />
       <structure type="chrome_scaled_image" name="IDR_SEARCH_CANCEL" file="blink/search_cancel.png" />
       <structure type="chrome_scaled_image" name="IDR_SEARCH_CANCEL_PRESSED" file="blink/search_cancel_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_SEARCH_MAGNIFIER" file="blink/search_magnifier.png" />
       <structure type="chrome_scaled_image" name="IDR_SEARCH_MAGNIFIER_RESULTS" file="blink/search_magnifier_results.png" />
       <structure type="chrome_scaled_image" name="IDR_TEXTAREA_RESIZER" file="blink/textarea_resize_corner.png" />
       <structure type="chrome_scaled_image" name="IDR_PASSWORD_GENERATION_ICON" file="blink/password_generation.png" />
       <structure type="chrome_scaled_image" name="IDR_PASSWORD_GENERATION_ICON_HOVER" file="blink/password_generation_hover.png" />
     </structures>
   </release>
 </grit>