Port identity_internals to mojo

chrome/test/base/web_ui_browser_test.h

Index: chrome/test/base/web_ui_browser_test.h
diff --git a/chrome/test/base/web_ui_browser_test.h b/chrome/test/base/web_ui_browser_test.h
index 32204425539036f746ecac1b4cf28ffaa7d4dbc6..a4cb28b270239b4b6f25260f38b1030fdaef86dc 100644
--- a/chrome/test/base/web_ui_browser_test.h
+++ b/chrome/test/base/web_ui_browser_test.h
@@ -95,6 +95,11 @@ class WebUIBrowserTest : public JavaScriptBrowserTest {
   // handler mocking.
   void BrowsePreload(const GURL& browse_to);
 
+  // Called by javascript-generated test bodies. In addition to doing
+  // everything in BrowsePreload(), it also waits until the
+  // DidRunWebUIMojoMain() event fires.
+  void BrowsePreloadAndWaitForMain(const GURL& browse_to);
+
   // Called by javascript-generated test bodies to browse to a page and preload
   // the javascript for the given |preload_test_fixture| and
   // |preload_test_name|. chrome.send will be overridden to allow javascript