Android/a11y: Add string for a11y "feed" role.

content/app/strings/content_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by content that
 need to be translated for each locale.-->
 
 <!-- Some of these strings and string descriptions were taken from
 WebKit/win/WebCoreLocalizedStrings.cpp so we include the original license
 below:
 
@@ skipping 276 matching lines @@
       </message>
       <message name="IDS_AX_ROLE_DEFINITION" desc="accessibility role description for a definition">
         definition
       </message>
       <message name="IDS_AX_ROLE_DESCRIPTION_LIST" desc="accessibility role description for a definition list">
         definition list
       </message>
       <message name="IDS_AX_ROLE_DESCRIPTION_TERM" desc="accessibility role description for description term(as in a description list)">
         term
       </message>
+      <message name="IDS_AX_ROLE_FEED" desc="Accessibility role description for a scrollable list of articles.">
+        feed
+      </message>
       <message name="IDS_AX_ROLE_FIGURE" desc="accessibility role description for figure">
         figure
       </message>
       <message name="IDS_AX_ROLE_FORM" desc="accessibility role description for form">
         form
       </message>
       <message name="IDS_AX_ROLE_FOOTER" desc="accessibility role description for footers">
         footer
       </message>
       <if expr="is_macosx">
@@ skipping 564 matching lines @@
         Off
       </message>
 
       <message name="IDS_PLUGIN_INITIALIZATION_ERROR" desc="A message displayed when a plugin failed to load">
         Couldn't load plugin.
       </message>
 
     </messages>
   </release>
 </grit>