[Files.app a11y] Add missing a11y labels into buttons

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 427 matching lines @@
   </message>
   <message name="IDS_FILE_BROWSER_CREATE_FOLDER_SHORTCUT_BUTTON_LABEL" desc="Menu item label, creating a shortcut of the selected folder to the left nav.">
     Create shortcut
   </message>
   <message name="IDS_FILE_BROWSER_REMOVE_FOLDER_SHORTCUT_BUTTON_LABEL" desc="Menu item label, unpinning the selected folder from the left nav.">
     Remove shortcut
   </message>
   <message name="IDS_FILE_BROWSER_SHARE_BUTTON_LABEL" desc="Menu item label, showing dialog to share the selected file.">
     Share
   </message>
+  <message name="IDS_FILE_BROWSER_TASKS_BUTTON_LABEL" desc="Label for button that selects a task to open the current file.">
+    Tasks
+  </message>
   <message name="IDS_FILE_BROWSER_CANCEL_SELECTION_BUTTON_LABEL" desc="Label for button that unselects all selected items.">
     Cancel selection
   </message>
+  <message name="IDS_FILE_BROWSER_CHANGE_TO_LISTVIEW_BUTTON_LABEL" desc="Label for button that changes the view mode to 'list view' mode.">
+    List view
+  </message>
+  <message name="IDS_FILE_BROWSER_CHANGE_TO_THUMBNAILVIEW_BUTTON_LABEL" desc="Label for button that changes the view mode to 'thumbnail view' mode.">
+    Thumbnail view
+  </message>
   <message name="IDS_FILE_BROWSER_CLOUD_IMPORT_TITLE" desc="Title of the cloud import feature.">
     Cloud backup
   </message>
   <message name="IDS_FILE_BROWSER_CLOUD_DESTINATION_FOLDER" desc="Title of the cloud import destination folder.">
     Chrome OS Cloud backup
   </message>
   <message name="IDS_FILE_BROWSER_CLOUD_IMPORT_DESCRIPTION" desc="Short description of the cloud import feature.">
     Back up your media device’s photos and videos to Google Drive.
   </message>
   <message name="IDS_FILE_BROWSER_CLOUD_IMPORT_START" desc="Tooltip of the toolbar button that starts backup.">
@@ skipping 5640 matching lines @@
   <message name="IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME" desc="Title for the flag to disable automatic timezone update on user location change.">
     Disable automatic timezone update by geolocation
   </message>
   <message name="IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Description for the flag to disable user setting to automatically update timezone by user geolocation.">
     If set, automatic timezone update by the current geolocation is turned off.
   </message>
   <message name="IDS_OPTIONS_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION" desc="Label for checkbox to allow automatic timezone update by user geolocation.">
     Automatically resolve timezone by geolocation
   </message>
 </grit-part>