Parse media keys for named command in the manifest.

ui/base/strings/ui_strings.grd

Index: ui/base/strings/ui_strings.grd
diff --git a/ui/base/strings/ui_strings.grd b/ui/base/strings/ui_strings.grd
index e412ed649924dac4001112cc6790af55458d8935..6ecbe0578d5259915fbfb0929bfbd475a920822e 100644
--- a/ui/base/strings/ui_strings.grd
+++ b/ui/base/strings/ui_strings.grd
@@ -1458,6 +1458,18 @@ need to be translated for each locale.-->
       <message name="IDS_APP_PERIOD_KEY" desc="Period key">
         Period
       </message>
+      <message name="IDS_APP_MEDIA_NEXT_TRACK_KEY" desc="Media next track key">
+        MediaNextTrack
+      </message>
+      <message name="IDS_APP_MEDIA_PLAY_PAUSE_KEY" desc="Media play pause key">
+        MediaPlayPause
+      </message>
+      <message name="IDS_APP_MEDIA_PREV_TRACK_KEY" desc="Media previous track key">
+        MediaPrevTrack
+      </message>
+      <message name="IDS_APP_MEDIA_STOP_KEY" desc="Media stop key">
+        MediaStop
+      </message>
 
       <!-- Shortcut Modifiers -->
       <message name="IDS_APP_CONTROL_MODIFIER" desc="Control key shortcut modifier">