Quick & dirty example of a WebUIBrowserTest using LoginManagerTestHelper.

chrome/test/base/in_process_browser_test.cc

Index: chrome/test/base/in_process_browser_test.cc
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index 82c0706dda5ab9cfdcbf5fe43d4da28166e836fc..6ecb435cc644f63c9cefe6393d7f7c3add8d964a 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -418,16 +418,20 @@ void InProcessBrowserTest::RunTestOnMainThreadLoop() {
   content::RunAllPendingInMessageLoop();
 
   SetUpOnMainThread();
+  LOG(ERROR) << "InProcessBrowserTest has set up on main thread.";
 #if defined(OS_MACOSX)
   autorelease_pool_->Recycle();
 #endif
 
-  if (!HasFatalFailure())
+  if (!HasFatalFailure()) {
+    LOG(ERROR) << "InProcessBrowserTest is running test on main thread.";
     RunTestOnMainThread();
+  }
 #if defined(OS_MACOSX)
   autorelease_pool_->Recycle();
 #endif
 
+  LOG(ERROR) << "InProcessBrowserTest is invoking cleanup..";
   // Invoke cleanup and quit even if there are failures. This is similar to
   // gtest in that it invokes TearDown even if Setup fails.
   CleanUpOnMainThread();