Move GetNewTabCSS() caching off the startup path.

chrome/browser/ui/webui/theme_source_unittest.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 <stddef.h>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/theme_source.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/theme_resources.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
@@ skipping 60 matching lines @@
 TEST_F(WebUISourcesTest, ThemeSourceCSS) {
   content::TestBrowserThread io_thread(BrowserThread::IO,
                                        base::MessageLoop::current());
   // Generating the test data for the NTP CSS would just involve copying the
   // method, or being super brittle and hard-coding the result (requiring
   // an update to the unittest every time the CSS template changes), so we
   // just check for a successful request and data that is non-null.
   size_t empty_size = 0;
 
   StartDataRequest("css/new_tab_theme.css");
+  base::RunLoop().RunUntilIdle();
   EXPECT_NE(result_data_size_, empty_size);
 
   StartDataRequest("css/new_tab_theme.css?pie");
+  base::RunLoop().RunUntilIdle();
   EXPECT_NE(result_data_size_, empty_size);
 
 #if !DCHECK_IS_ON()
   // Check that we send NULL back when we can't find what we're looking for.
   StartDataRequest("css/WRONGURL");
   EXPECT_EQ(result_data_size_, empty_size);
 #endif
 }