Add "Ignored" tag on unsupported Flash per-site settings.

As per request from A11Y, instead of just displaying unsupported site
settings with strike-through, add a label spelling "Ignored" next to it.

Bug: 1116608
Change-Id: Ie47a5e7bf3dd8a4cf12ccc0e9f75b3d48fe8d62d
TBR: khorimoto@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358109Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Auto-Submit: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798441}

chrome/browser/resources/settings/site_settings/site_list_entry.html

@@ -7,10 +7,14 @@
         flex: 1
       }
 
-      .settings-row.discarded {
+      .settings-row.discarded .display-name {
         text-decoration: line-through;
       }
 
+      .settings-row.discarded .discarded-label {
+        margin-inline-start: 8px;
+      }
+
       /* Tooltip is hidden since site-list will display a common tooltip. */
       cr-policy-pref-indicator::part(tooltip) {
         display: none;
@@ -22,7 +26,10 @@
         <site-favicon url="[[model.origin]]"></site-favicon>
         <div class="middle no-min-width">
           <div class="text-elide">
-            <span class="url-directionality">[[computeDisplayName_(model)]]
+            <span class="display-name url-directionality">
+              [[computeDisplayName_(model)]]</span>
+            <span class="discarded-label"
+              hidden="[[!model.isDiscarded]]">$i18n{discardedPerSiteSetting}
             </span>
           </div>
 

chrome/browser/ui/webui/settings/settings_localized_strings_provider.cc

@@ -1231,6 +1231,10 @@ void AddPrivacyStrings(content::WebUIDataSource* html_source,
   static constexpr webui::LocalizedString kLocalizedStrings[] = {
       {"privacyPageTitle", IDS_SETTINGS_PRIVACY},
       {"privacyPageMore", IDS_SETTINGS_PRIVACY_MORE},
+      // TODO(crbug.com/1116608): This seemingly unrelated string resource is
+      // used because it already has a localized version available in M85, so
+      // we can ship this label in M85 on short notice.
+      {"discardedPerSiteSetting", IDS_POLICY_LABEL_IGNORED},
       {"doNotTrack", IDS_SETTINGS_ENABLE_DO_NOT_TRACK},
       {"doNotTrackDialogTitle", IDS_SETTINGS_ENABLE_DO_NOT_TRACK_DIALOG_TITLE},
       // TODO(crbug.com/1062607): This string is no longer used. Remove.