Ensure tests have an active task runner

chrome/browser/extensions/extension_action_manager_unittest.cc

 // Copyright 2014 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/browser/extensions/extension_action_manager.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension_builder.h"
 #include "extensions/common/manifest_handlers/icons_handler.h"
 #include "extensions/common/value_builder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 namespace {
 
@@ skipping 28 matching lines @@
                              const Extension& extension);
 
   // Tests that values that are missing from the |action_type| key are properly
   // populated with values from the other keys in the manifest (e.g.
   // "default_icon" key of |action_type| is populated with "icons" key).
   void TestPopulateMissingValues(const char* action_type);
 
   ExtensionActionManager* manager() { return manager_; }
 
  private:
+  content::TestBrowserThreadBundle thread_bundle_;
   ExtensionRegistry* registry_;
   int curr_id_;
   ExtensionActionManager* manager_;
   scoped_ptr<TestingProfile> profile_;
 };
 
 ExtensionActionManagerTest::ExtensionActionManagerTest()
     : curr_id_(0),
       profile_(new TestingProfile) {
   registry_ = ExtensionRegistry::Get(profile_.get());
@@ skipping 147 matching lines @@
       manager()->GetBestFitAction(*extension.get(), ActionInfo::TYPE_BROWSER);
 
   // Now these values match because |extension| does not have page action
   // defaults.
   ASSERT_TRUE(TitlesMatch(*extension.get(), *action));
   ASSERT_TRUE(IconsMatch(*extension.get(), 48, *action, 38));
 }
 
 }  // namespace
 }  // namespace extensions