[subresource_filter] Add Page Info subtitle on desktop + placeholder string

chrome/browser/ui/page_info/page_info_ui.cc

Index: chrome/browser/ui/page_info/page_info_ui.cc
diff --git a/chrome/browser/ui/page_info/page_info_ui.cc b/chrome/browser/ui/page_info/page_info_ui.cc
index 401b5cd12f5307c98b44dc619dbf3c8189db364e..0e29128e8315530b1f477db79723a560c5f87b72 100644
--- a/chrome/browser/ui/page_info/page_info_ui.cc
+++ b/chrome/browser/ui/page_info/page_info_ui.cc
@@ -339,6 +339,9 @@ base::string16 PageInfoUI::PermissionDecisionReasonToUIString(
     }
   }
 
+  if (permission.type == CONTENT_SETTINGS_TYPE_SUBRESOURCE_FILTER)
+    message_id = IDS_PAGE_INFO_PERMISSION_SUBRESOURCE_FILTER_SUBTITLE;
+
   if (message_id == kInvalidResourceID)
     return base::string16();
   return l10n_util::GetStringUTF16(message_id);