Add SocketWatcherFactory as a helper class to NQE

chrome/browser/android/net/external_estimate_provider_android_unittest.cc

 // Copyright 2015 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/android/net/external_estimate_provider_android.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/at_exit.h"
 #include "base/test/histogram_tester.h"
 #include "base/time/time.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "net/base/network_quality_estimator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 // Tests if the |ExternalEstimateProviderAndroid| APIs return false without the
 // downstream implementation.
 TEST(ExternalEstimateProviderAndroidTest, BasicsTest) {
   base::ShadowingAtExitManager at_exit_manager;
   chrome::android::ExternalEstimateProviderAndroid external_estimate_provider;
@@ skipping 44 matching lines @@
   bool GetTimeSinceLastUpdate(
       base::TimeDelta* time_since_last_update) const override {
     *time_since_last_update = base::TimeDelta::FromMilliseconds(1);
     return true;
   }
 };
 
 // Tests if the |ExternalEstimateProviderAndroid| notifies
 // |NetworkQualityEstimator|.
 TEST(ExternalEstimateProviderAndroidTest, DelegateTest) {
+  content::TestBrowserThreadBundle thread_bundle(
+      content::TestBrowserThreadBundle::IO_MAINLOOP);
+
   base::ShadowingAtExitManager at_exit_manager;
   base::HistogramTester histogram_tester;
   scoped_ptr<TestExternalEstimateProviderAndroid> external_estimate_provider;
   external_estimate_provider.reset(new TestExternalEstimateProviderAndroid());
 
   TestExternalEstimateProviderAndroid* ptr = external_estimate_provider.get();
   std::map<std::string, std::string> variation_params;
   TestNetworkQualityEstimator network_quality_estimator(
       std::move(external_estimate_provider), variation_params);
   ptr->NotifyUpdatedEstimateAvailable();
@@ skipping 20 matching lines @@
                                      2);
 
   // EXTERNAL_ESTIMATE_PROVIDER_STATUS_CALLBACK
   histogram_tester.ExpectBucketCount("NQE.ExternalEstimateProviderStatus", 4,
                                      1);
 
   histogram_tester.ExpectTotalCount("NQE.ExternalEstimateProviderStatus", 6);
 }
 
 }  // namespace