Ensure tests have an active task runner

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings_test_utils.h

 // 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.
 
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_
 
 #include <map>
 #include <string>
 
@@ skipping 65 matching lines @@
   void InitWithStatisticsPrefs();
   void InitDataReductionProxy(bool enabled_at_startup);
   void CheckDataReductionProxySyntheticTrial(bool enabled);
   void CheckDataReductionProxyLoFiSyntheticTrial(bool enabled);
   bool SyntheticFieldTrialRegistrationCallback(const std::string& trial_name,
                                                const std::string& group_name) {
     synthetic_field_trials_[trial_name] = group_name;
     return true;
   }
 
+  base::MessageLoopForIO message_loop_;
   scoped_ptr<DataReductionProxyTestContext> test_context_;
   scoped_ptr<DataReductionProxySettings> settings_;
   base::Time last_update_time_;
   std::map<std::string, std::string> synthetic_field_trials_;
 };
 
 // Test implementations should be subclasses of an instantiation of this
 // class parameterized for whatever DataReductionProxySettings class
 // is being tested.
 template <class C>
 class ConcreteDataReductionProxySettingsTest
     : public DataReductionProxySettingsTestBase {
  public:
   typedef MockDataReductionProxySettings<C> MockSettings;
   virtual void ResetSettings(bool allowed,
                              bool fallback_allowed,
                              bool alt_allowed,
                              bool promo_allowed,
                              bool holdback) override {
     return DataReductionProxySettingsTestBase::ResetSettings<C>(
         allowed, fallback_allowed, alt_allowed, promo_allowed, holdback);
   }
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SETTINGS_TEST_UTILS_H_