Fix accessibility issues in AudioPlayer and VideoPlayer.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 1005 matching lines @@
   <message name="IDS_FILE_BROWSER_SPACE_AVAILABLE" desc="Menu item showing space left for storage.">
     <ph name="SPACE_AVAILABLE">$1<ex>4.8 GB</ex></ph> left
   </message>
   <message name="IDS_FILE_BROWSER_WAITING_FOR_SPACE_INFO" desc="Menu item, saying that FileBrowser is waiting for space information for storage. When actual data arrives, this item will be replaced with IDS_FILE_BROWSER_SPACE_AVAILABLE">
     Waiting for space info...
   </message>
   <message name="IDS_FILE_BROWSER_FAILED_SPACE_INFO" desc="Menu item, saying that FileBrowser is failed to retrieve space information.">
     Failed to retrieve space info
   </message>
 
+<!-- Common for Audio player and Media player -->
+  <message name="IDS_MEDIA_PLAYER_PLAY_BUTTON_LABEL" desc="Label for the Play button of media players (audio player / video player).">
+    Play
+  </message>
+  <message name="IDS_MEDIA_PLAYER_PAUSE_BUTTON_LABEL" desc="Label for the Pause button of media player (audio player / video player).">
+    Pause
+  </message>
+  <message name="IDS_MEDIA_PLAYER_MUTE_BUTTON_LABEL" desc="Label for the Mute button of media player (audio player / video player).">
+    Mute
+  </message>
+  <message name="IDS_MEDIA_PLAYER_UNMUTE_BUTTON_LABEL" desc="Label for the Unmute button of media player (audio player / video player).">
+    Unmute
+  </message>
+  <message name="IDS_MEDIA_PLAYER_PREVIOUS_BUTTON_LABEL" desc="Label for the Previous button, which is used to select previous video in the video player, or select previous track in the audio player.">
+    Previous
+  </message>
+  <message name="IDS_MEDIA_PLAYER_NEXT_BUTTON_LABEL" desc="Label for the Next button, which is used to select previous video in the video player, or select previous track in the audio player.">
+    Next
+  </message>
+  <message name="IDS_MEDIA_PLAYER_SEEK_SLIDER_LABEL" desc="Label for the seek bar of media player.">
+    Seek slider
+  </message>
+  <message name="IDS_MEDIA_PLAYER_VOLUME_SLIDER_LABEL" desc="Label for the volume slider of media player.">
+    Volume slider
+  </message>
+
+<!-- Audio Player -->
+  <message name="IDS_AUDIO_PLAYER_SHUFFLE_BUTTON_LABEL" desc="Label for the Shuffle button of audio player.">
+    Shuffle
+  </message>
+  <message name="IDS_AUDIO_PLAYER_REPEAT_BUTTON_LABEL" desc="Label for the Repeat button of audio player">
+    Repeat
+  </message>
+  <message name="IDS_AUDIO_PLAYER_OPEN_VOLUME_SLIDER_BUTTON_LABEL" desc="Label for a button which is used to open volume slider in audio player.">
+    Open volume slider
+  </message>
+  <message name="IDS_AUDIO_PLAYER_OPEN_PLAY_LIST_BUTTON_LABEL" desc="Label for a button which is used to open play list in audio player.">
+    Open play list
+  </message>
+
 <!-- Video Player -->
   <message name="IDS_VIDEO_PLAYER_PLAY_THIS_COMPUTER" desc="In the video player app, message of menu item which is shown at the top of the list of Chromecasts. This menuitem is to play the video on this computer (locally), intead of on TVs with Chromecast.">
     This computer
   </message>
   <message name="IDS_VIDEO_PLAYER_PLAYING_ON" desc="In the video player app, message is shown ahead of the name of the current chromecast which plays the video now. For example, if this message is 'Playing on' and the Chromecast name is 'Foocast', 'Playing on Foocast' is shown.">
     Playing on
   </message>
   <message name="IDS_VIDEO_PLAYER_PLAY_ON" desc="In the video player app, message is shown above the list of cast devices. The user will select one of them to play the current video on selected device.">
     Play on
   </message>
   <message name="IDS_VIDEO_PLAYER_VIDEO_FILE_UNSUPPORTED" desc="In the video player app, message informing that the video could not be played.">
     This file could not be played.
   </message>
   <message name="IDS_VIDEO_PLAYER_VIDEO_FILE_UNSUPPORTED_FOR_CAST" desc="Error message which is shown when the video which an user tried to play is not supported by the current cast device.">
     Sorry, this video is not supported by your cast device.
   </message>
   <message name="IDS_VIDEO_PLAYER_PLAYBACK_ERROR" desc="In the video player app, message informing that an error occured while playing the movie.">
     An error occurred. Click to restart from the beginning.
   </message>
   <message name="IDS_VIDEO_PLAYER_LOOPED_MODE" desc="In the video player app, message informing that the movie will be played in a loop.">
     This video will keep playing until the cows come home.
   </message>
+  <message name="IDS_VIDEO_PLAYER_FULL_SCREEN_BUTTON_LABEL" desc="Label for a button which is used to enter full screen mode in video player.">
+    Full screen
+  </message>
+  <message name="IDS_VIDEO_PLAYER_EXIT_FULL_SCREEN_BUTTON_LABEL" desc="Label for a button which is used to exit full screen mode in video player.">
+    Exit full screen
+  </message>
 
 <!-- Imageburn Strings -->
   <message name="IDS_CHECKING_FOR_UPDATES" desc="Notification for checking for update">
     Checking for updates
   </message>
   <message name="IDS_UPDATE_VERIFYING" desc="Message that the system is verifying an update">
     Verifying...
   </message>
   <message name="IDS_UPDATE_FINALIZING" desc="Message that the system is finalizing an update">
     Finalizing...
@@ skipping 5257 matching lines @@
     Installing
   </message>
   <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_NAME" desc="Name of the flag used to enable launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
     Chrome Web Store Gallery app for printer drivers
   </message>
   <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_DESCRIPTION" desc="Description of a flag in chrome://flags that enables launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
     Enables Chrome Web Store Gallery app for printer drivers. The app searches Chrome Web Store for extensions that support printing to a USB printer with specific USB ID.
   </message>
 
 </grit-part>