Add SocketWatcherFactory as a helper class to NQE

chrome/browser/android/net/external_estimate_provider_android_unittest.cc

Index: chrome/browser/android/net/external_estimate_provider_android_unittest.cc
diff --git a/chrome/browser/android/net/external_estimate_provider_android_unittest.cc b/chrome/browser/android/net/external_estimate_provider_android_unittest.cc
index b5205816a3c68d151f8019679fb2a2b1b95f855d..677695757dc47bda1ec13009eba9e6cd631d3082 100644
--- a/chrome/browser/android/net/external_estimate_provider_android_unittest.cc
+++ b/chrome/browser/android/net/external_estimate_provider_android_unittest.cc
@@ -10,6 +10,7 @@
 #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"
 
@@ -74,6 +75,9 @@ class TestExternalEstimateProviderAndroid
 // 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;