Add new string.

"Answering on another device":
  To display when disambiguating "Ok Google" and we lose devie
  selection to another surface.

"What's on my screen":
  show on suggestion chip in Assistant UI to initiate a contextual search

Bug: b:112464186
Change-Id: Ia61f12d3c39f5005486824ad7982736719dfd14b
Reviewed-on: https://chromium-review.googlesource.com/1173263Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Xiao Yang <yanxiao@google.com>
Cr-Commit-Position: refs/heads/master@{#583058}

ash/ash_strings.grd

@@ -1730,6 +1730,12 @@ This file contains the strings for ash.
       <message name="IDS_ASH_ASSISTANT_OPT_IN_PROMPT" desc="Message shown in Assistant UI when the user is opted out to promote an opted in experience. $1 = IDS_ASH_ASSISTANT_OPT_IN_UNLOCK_MORE_FEATURES, $2 = IDS_ASH_ASSISTANT_OPT_IN_GET_STARTED">
         <ph name="UNLOCK_MORE_FEATURES">$1<ex>Unlock more Assistant features.</ex></ph>  <ph name="GET_STARTED">$2<ex>Get Started</ex></ph>
       </message>
+      <message name="IDS_ASH_ASSISTANT_MULTI_DEVICE_HOTWORD_LOSS" desc="Message shown in Assistant UI when we have detected hotword but are answering on another device.">
+        Answering on another device
+      </message>
+      <message name="IDS_ASH_ASSISTANT_WHATS_ON_MY_SCREEN" desc="Message shown on suggestion chip in Assistant UI to initiate a contextual search for results matching screen content.">
+        What's on my screen?
+      </message>
       <message name="IDS_ASH_MESSAGE_CENTER_UNLOCK_TO_PERFORM_ACTION" desc="The short message to encourage user to unlock the device so that Chrome OS can perform the notification action selected by user after unlocking.">
         Unlock device to perform the notification action
       </message>