Do the ReloadLocaleResources() call on the IO thread to avoid synchronization issues.

chrome/browser/ui/webui/bidi_checker_web_ui_test.h

Index: chrome/browser/ui/webui/bidi_checker_web_ui_test.h
diff --git a/chrome/browser/ui/webui/bidi_checker_web_ui_test.h b/chrome/browser/ui/webui/bidi_checker_web_ui_test.h
index b4a107fce6e7ca2fc7690f17361d753d9ba17c16..417e080ad6a1b7eb11e591f62c13258f42467753 100644
--- a/chrome/browser/ui/webui/bidi_checker_web_ui_test.h
+++ b/chrome/browser/ui/webui/bidi_checker_web_ui_test.h
@@ -11,6 +11,10 @@
 #include "chrome/browser/ui/webui/web_ui_browsertest.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
+namespace base {
+class WaitableEvent;
+}
+
 // Base class for BidiChecker-based tests. Preloads the BidiChecker JS library
 // for each test.
 class WebUIBidiCheckerBrowserTest : public WebUIBrowserTest {
@@ -43,6 +47,8 @@ class WebUIBidiCheckerBrowserTestRTL : public WebUIBidiCheckerBrowserTest {
   virtual void SetUpOnMainThread() OVERRIDE;
   virtual void CleanUpOnMainThread() OVERRIDE;
 
+  static void SetUpOnIOThread(base::WaitableEvent* event);
+
   // The app locale before we change it
   std::string app_locale_;
 };