Add an accessibility audit test for WebUI pages

chrome/browser/ui/webui/web_ui_browsertest.h

Index: chrome/browser/ui/webui/web_ui_browsertest.h
diff --git a/chrome/browser/ui/webui/web_ui_browsertest.h b/chrome/browser/ui/webui/web_ui_browsertest.h
index f184570deb369472245840dd3f09436013781bf7..271dcf2bf93e30ab2b064ea93c54b38767483e4e 100644
--- a/chrome/browser/ui/webui/web_ui_browsertest.h
+++ b/chrome/browser/ui/webui/web_ui_browsertest.h
@@ -52,6 +52,9 @@ class WebUIBrowserTest
   // as relative to the test data dir.
   void AddLibrary(const FilePath& library_path);
 
+  // Add a helper JS library from a path relative to base::DIR_SOURCE_ROOT.
+  void AddLibraryFromPath(const FilePath path);
+
   // Runs a javascript function in the context of all libraries.
   // Note that calls to functions in test_api.js are not supported.
   // Takes ownership of Value* arguments.