[SH iOS] Adding UI string for Link to Text

This adds the string used for the entry point for the Link to Text
(Shared Highlighting) feature.

Bug: 1099268
Change-Id: Id1f990658d32a2c206d8b1115fe581493c42969e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315087Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791830}

ios/chrome/app/strings/ios_strings.grd

@@ -2491,6 +2491,9 @@ New Search
       <message name="IDS_IOS_LOCATION_BAR_SIGN_IN" desc="Text shown in the location bar while an HTTP authentication dialog is displayed.">
           Sign in to website
       </message>
+      <message name="IDS_IOS_SHARE_LINK_TO_TEXT" desc="Option that appears in the iOS Edit Menu when highlighting text (alongside options like Copy, Paste, and Share). When selected, this generates a special URL that will open the current page and jump to/highlight the user's current selection. The user will then have the chance to share this special URL through the normal iOS sharing menu.">
+          Link to Text
+      </message>
     </messages>
   </release>
 </grit>

ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SHARE_LINK_TO_TEXT.png.sha1

+f90bca24c0547e4e80f9b3e36bfd4c604d7489d5
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