Ensure tests have an active task runner

components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics_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 "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params_test_utils.h"
 #include "net/base/load_flags.h"
 #include "net/log/net_log.h"
 #include "net/proxy/proxy_server.h"
 #include "net/proxy/proxy_service.h"
 #include "net/socket/socket_test_util.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using net::MockRead;
 
 namespace data_reduction_proxy {
 
 TEST(ChromeNetworkDailyDataSavingMetricsTest,
      GetDataReductionProxyRequestType) {
+  base::MessageLoopForIO message_loop;
   scoped_ptr<DataReductionProxyTestContext> test_context =
       DataReductionProxyTestContext::Builder()
           .WithParamsFlags(DataReductionProxyParams::kAllowed)
           .WithParamsDefinitions(TestDataReductionProxyParams::HAS_ORIGIN)
           .Build();
   TestDataReductionProxyConfig* config = test_context->config();
 
   net::ProxyConfig data_reduction_proxy_config;
   data_reduction_proxy_config.proxy_rules().ParseFromString(
       "http=" + config->test_params()->origin().host_port_pair().ToString() +
@@ skipping 118 matching lines @@
     }
 
     EXPECT_EQ(test_case.expected_request_type,
               GetDataReductionProxyRequestType(
                   *request, data_reduction_proxy_config,
                   *test_context->config()));
   }
 }
 
 }  // namespace data_reduction_proxy