Quick & dirty example of a WebUIBrowserTest using LoginManagerTestHelper.

chrome/test/base/in_process_browser_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/base/in_process_browser_test.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 400 matching lines @@
   // browser shutdown). To avoid this, the following pool is recycled after each
   // time code is directly executed.
   autorelease_pool_ = new base::mac::ScopedNSAutoreleasePool;
 #endif
 
   // Pump any pending events that were created as a result of creating a
   // browser.
   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();
 #if defined(OS_MACOSX)
   autorelease_pool_->Recycle();
 #endif
 
   // Sometimes tests leave Quit tasks in the MessageLoop (for shame), so let's
   // run all pending messages here to avoid preempting the QuitBrowsers tasks.
   // TODO(jbates) Once crbug.com/134753 is fixed, this can be removed because it
@@ skipping 30 matching lines @@
   // On the Mac, this eventually reaches
   // -[BrowserWindowController windowWillClose:], which will post a deferred
   // -autorelease on itself to ultimately destroy the Browser object. The line
   // below is necessary to pump these pending messages to ensure all Browsers
   // get deleted.
   content::RunAllPendingInMessageLoop();
   delete autorelease_pool_;
   autorelease_pool_ = NULL;
 #endif
 }