Add support to previews/ for Server LoFi and LitePages

chrome/browser/android/offline_pages/offline_page_request_job_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 "chrome/browser/android/offline_pages/offline_page_request_job.h"
 
 #include "base/callback.h"
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
@@ skipping 175 matching lines @@
 class TestPreviewsDecider : public previews::PreviewsDecider {
  public:
   TestPreviewsDecider() : should_allow_preview_(false) {}
   ~TestPreviewsDecider() override {}
 
   bool ShouldAllowPreview(const net::URLRequest& request,
                           previews::PreviewsType type) const override {
     return should_allow_preview_;
   }
 
+  bool ShouldAllowPreviewAtECT(
+      const net::URLRequest& request,
+      previews::PreviewsType type,
+      net::EffectiveConnectionType effective_connection_type_threshold)
+      const override {
+    return should_allow_preview_;
+  }
+
   void set_should_allow_preview(bool should_allow_preview) {
     should_allow_preview_ = should_allow_preview;
   }
 
  private:
   bool should_allow_preview_;
 
   DISALLOW_COPY_AND_ASSIGN(TestPreviewsDecider);
 };
 
@@ skipping 691 matching lines @@
   ASSERT_TRUE(offline_page_tab_helper()->GetOfflinePageForTest());
   EXPECT_EQ(offline_id4(),
             offline_page_tab_helper()->GetOfflinePageForTest()->offline_id);
   ExpectOneUniqueSampleForAggregatedRequestResult(
       OfflinePageRequestJob::AggregatedRequestResult::
           SHOW_OFFLINE_ON_DISCONNECTED_NETWORK);
   ExpectOpenFileErrorCode(net::ERR_FILE_NOT_FOUND);
 }
 
 }  // namespace offline_pages