[Media Router] Strings for media remoting controls.

These strings will be used in a dropdown menu (which will replace the
"always use mirroring" checkbox) in the route controls.

Bug: 774245
Change-Id: If851a0c80cf715f360f30238273d926783f72a5b
Reviewed-on: https://chromium-review.googlesource.com/798590
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520793}

chrome/app/media_router_strings.grdp

@@ -184,6 +184,15 @@
   <message name="IDS_MEDIA_ROUTER_ROUTE_DETAILS_ALWAYS_USE_MIRRORING_TITLE" desc="The title for a toggle setting to choose whether video should always be mirrored (played locally and remotely), or played only remotely.">
     Always use mirroring
   </message>
+  <message name="IDS_MEDIA_ROUTER_ROUTE_DETAILS_FULLSCREEN_VIDEOS_DROPDOWN_TITLE" desc="The title for a toggle setting to choose whether fullscreen videos should always be mirrored (played locally and remotely), or played only remotely.">
+    Show fullscreen videos on:
+  </message>
+  <message name="IDS_MEDIA_ROUTER_ROUTE_DETAILS_FULLSCREEN_VIDEOS_BOTH_SCREENS" desc="Settings option to play fullscreen videos both locally and remotely.">
+    Both screens
+  </message>
+  <message name="IDS_MEDIA_ROUTER_ROUTE_DETAILS_FULLSCREEN_VIDEOS_REMOTE_SCREEN" desc="Settings option to play fullscreen videos only remotely.">
+    Remote screen
+  </message>
 
   <!-- Sink List -->
   <message name="IDS_MEDIA_ROUTER_DESTINATION_MISSING" desc="Link to display when no Cast destinations are found which, on click, opens a page to the Chromecast help center explaining possible reasons why none are detected.">