cros: Fix various small issues with cast tray entry.

ash/ash_strings.grd

Index: ash/ash_strings.grd
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index 4a366cf13740a8eca55edd781a6d816401a75ad2..76c3e8ae4abc263ec9a2782697ec93aa01f3d16c 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -226,12 +226,21 @@ Press Ctrl+Alt+Z to disable.
       <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_DESKTOP" desc="The label used in the tray popup to tell the user we are casting the desktop.">
         Casting screen to <ph name="RECEIVER_NAME">$1<ex>Living Room</ex></ph>
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_DESKTOP_ACCESSIBILITY_STOP" desc="Stop button accessibility label used in the tray popup to tell the user to stop a cast to the desktop.">
+        Stop casting screen to <ph name="RECEIVER_NAME">$1<ex>Living Room</ex></ph>
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_TAB" desc="The title label used in the tray popup to tell the user we are casting a tab.">
         Casting <ph name="TAB_NAME">$1<ex>YouTube</ex></ph> to <ph name="RECEIVER_NAME">$2<ex>Living Room</ex></ph>
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_TAB_ACCESSIBILITY_STOP" desc="Stop button accessibility label used in the tray popup to tell the user to stop a tab cast.">
+        Stop casting <ph name="TAB_NAME">$1<ex>YouTube</ex></ph> to <ph name="RECEIVER_NAME">$2<ex>Living Room</ex></ph>
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_UNKNOWN" desc="The label used when we have detected we are casting but do not know what we are casting or who we are casting to.">
         Casting to an unknown receiver
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAST_CAST_UNKNOWN_ACCESSIBILITY_STOP" desc="Stop button accessibility label used in the tray popup to tell the user to stop a cast, but we do not know what we are casting or who we are casting to.">
+        Stop casting to an unknown receiver
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_CAST_DESKTOP" desc="The label used in the tray popup to notify that desktop may be cast.">
         Cast devices available
       </message>