Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_io_data_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/previews/core/previews_io_data.h"
 
 #include <map>
 #include <memory>
 #include <string>
 
@@ skipping 204 matching lines @@
       2);
 
   // Set NQE type to fast enough.
   network_quality_estimator.set_effective_connection_type(
       net::EFFECTIVE_CONNECTION_TYPE_2G);
   EXPECT_FALSE(io_data()->ShouldAllowPreview(*request, PreviewsType::OFFLINE));
   histogram_tester.ExpectBucketCount(
       "Previews.EligibilityReason.Offline",
       static_cast<int>(PreviewsEligibilityReason::NETWORK_NOT_SLOW), 1);
 
+  // LitePage makes its own decision about network quality.
+  EXPECT_TRUE(io_data()->ShouldAllowPreview(*request, PreviewsType::LITE_PAGE));
+  histogram_tester.ExpectBucketCount(
+      "Previews.EligibilityReason.LitePage",
+      static_cast<int>(PreviewsEligibilityReason::ALLOWED), 1);
+
   // Set NQE type to slow.
   network_quality_estimator.set_effective_connection_type(
       net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
 
   request->SetLoadFlags(net::LOAD_BYPASS_CACHE);
   EXPECT_FALSE(io_data()->ShouldAllowPreview(*request, PreviewsType::OFFLINE));
   histogram_tester.ExpectBucketCount(
       "Previews.EligibilityReason.Offline",
-      static_cast<int>(
-          PreviewsEligibilityReason::RELOAD_DISALLOWED_FOR_OFFLINE),
-      1);
+      static_cast<int>(PreviewsEligibilityReason::RELOAD_DISALLOWED), 1);
+
+  // Server LoFi ignores reload when deciding to show the preview.
+  EXPECT_TRUE(
+      io_data()->ShouldAllowPreview(*request, PreviewsType::SERVER_LOFI));
+  histogram_tester.ExpectBucketCount(
+      "Previews.EligibilityReason.ServerLoFi",
+      static_cast<int>(PreviewsEligibilityReason::ALLOWED), 1);
 
   request->SetLoadFlags(0);
   EXPECT_TRUE(io_data()->ShouldAllowPreview(*request, PreviewsType::OFFLINE));
   histogram_tester.ExpectBucketCount(
       "Previews.EligibilityReason.Offline",
       static_cast<int>(PreviewsEligibilityReason::ALLOWED), 1);
 
   histogram_tester.ExpectTotalCount("Previews.EligibilityReason.Offline", 8);
 
   variations::testing::ClearAllVariationParams();
 }
 
 }  // namespace previews