Will now DCHECK that test writers start the embedded server before using it.

chrome/browser/extensions/lazy_background_page_apitest.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 "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/bookmark_test_helpers.h"
@@ skipping 156 matching lines @@
   EXPECT_FALSE(pm->GetBackgroundHostForExtension(last_loaded_extension_id_));
 
   // Page action is shown.
   page_action_changed.Wait();
   EXPECT_EQ(num_page_actions + 1,
             browser()->window()->GetLocationBar()->
                 GetLocationBarForTesting()->PageActionVisibleCount());
 }
 
 IN_PROC_BROWSER_TEST_F(LazyBackgroundPageApiTest, Filters) {
+  ASSERT_TRUE(StartEmbeddedTestServer());
+
   const Extension* extension = LoadExtensionAndWait("filters");
   ASSERT_TRUE(extension);
 
   // Lazy Background Page doesn't exist yet.
   ExtensionProcessManager* pm =
       extensions::ExtensionSystem::Get(browser()->profile())->process_manager();
   EXPECT_FALSE(pm->GetBackgroundHostForExtension(last_loaded_extension_id_));
 
   // Open a tab to a URL that will fire a webNavigation event.
   LazyBackgroundObserver page_complete;
@@ skipping 318 matching lines @@
 
 // Tests that the lazy background page will be unloaded if the onSuspend event
 // handler calls an API function such as chrome.storage.local.set().
 // See: http://crbug.com/296834
 IN_PROC_BROWSER_TEST_F(LazyBackgroundPageApiTest, OnSuspendUseStorageApi) {
   EXPECT_TRUE(LoadExtensionAndWait("on_suspend"));
 }
 
 // TODO: background page with timer.
 // TODO: background page that interacts with popup.