Add UMA for network type at request start

components/offline_pages/core/background/request_coordinator_unittest.cc

 // Copyright 2016 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/offline_pages/core/background/request_coordinator.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 766 matching lines @@
       &RequestCoordinatorTest::GetRequestsDone, base::Unretained(this)));
   PumpLoop();
 
   // Now just one request in the queue since non-retryable failure.
   EXPECT_EQ(1UL, last_requests().size());
   // Check that the observer got the notification that we failed (and the
   // subsequent notification that the request was removed).
   EXPECT_TRUE(observer().completed_called());
   EXPECT_EQ(RequestCoordinator::BackgroundSavePageResult::LOADING_FAILURE,
             observer().last_status());
+  // We should have a histogram entry for the effective network conditions
+  // when this failed request began.
+  histograms().ExpectBucketCount(
+      "OfflinePages.Background.EffectiveConnectionType.OffliningStartType."
+      "bookmark",
+      net::NetworkChangeNotifier::CONNECTION_UNKNOWN, 1);
 }
 
 TEST_F(RequestCoordinatorTest, OfflinerDoneRequestFailedNoNextFailure) {
   // Add a request to the queue, wait for callbacks to finish.
   offline_pages::SavePageRequest request(kRequestId1, kUrl1, kClientId1,
                                          base::Time::Now(), kUserRequested);
   SetupForOfflinerDoneCallbackTest(&request);
   EnableOfflinerCallback(false);
 
   // Add second request to the queue to check handling when first fails.
@@ skipping 776 matching lines @@
   PumpLoop();
 
   // The last time would trigger the snapshot on last retry and succeed.
   EXPECT_FALSE(OfflinerWasCanceled());
   EXPECT_EQ(RequestCoordinator::BackgroundSavePageResult::SUCCESS,
             observer().last_status());
   EXPECT_TRUE(observer().completed_called());
 }
 
 }  // namespace offline_pages