Video Player: Add a message which is shown on casting

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>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 962 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>
 
+<!-- Video Player -->
+  <message name="IDS_VIDEO_PLAYER_PLAY_THIS_COMPUTER" desc="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="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>
+
 <!-- 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...
   </message>
@@ skipping 4570 matching lines @@
   </message>
 
   <!-- 'OK Google' voice search activation display strings -->
   <message name="IDS_FLAGS_OK_GOOGLE_NAME" desc="Name of about:flags option for Ok Google.">
     Enable 'Ok Google' to activate voice search.
   </message>
   <message name="IDS_FLAGS_OK_GOOGLE_DESCRIPTION" desc="Description of about:flags option Ok Google.">
     If enabled, there will be an option in chrome:settings to enable saying 'Ok Google' to activate voice search.
   </message>
 </grit-part>