Reland of Moving previews code from components/ to chrome/

components/previews/core/previews_experiments_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_experiments.h"
 
 #include <string>
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 127 matching lines @@
     EXPECT_EQ(effective_connection_type,
               params::EffectiveConnectionTypeThreshold());
   }
 }
 
 }  // namespace
 
 // Verifies that we can enable offline previews via field trial.
 TEST_F(PreviewsExperimentsTest, TestFieldTrialOfflinePage) {
   EXPECT_FALSE(IsIncludedInClientSidePreviewsExperimentsFieldTrial());
-  EXPECT_FALSE(IsPreviewsTypeEnabled(PreviewsType::OFFLINE));
+  EXPECT_FALSE(params::IsOfflinePreviewsEnabled());
 
   base::FieldTrialList field_trial_list(nullptr);
   ASSERT_TRUE(EnableOfflinePreviewsForTesting());
 
   EXPECT_TRUE(IsIncludedInClientSidePreviewsExperimentsFieldTrial());
-  EXPECT_TRUE(IsPreviewsTypeEnabled(PreviewsType::OFFLINE));
+  EXPECT_TRUE(params::IsOfflinePreviewsEnabled());
   variations::testing::ClearAllVariationParams();
 }
 
 // Verifies that we can enable offline previews via field trial and that the
 // default params for previews field trials are accurate.
 TEST_F(PreviewsExperimentsTest, TestAllDefaultParams) {
   VerifyDefaultParams();
   base::FieldTrialList field_trial_list(nullptr);
   EXPECT_TRUE(variations::AssociateVariationParams(
       "ClientSidePreviews", "Enabled", GetFieldTrialParams()));
   EXPECT_TRUE(
       base::FieldTrialList::CreateFieldTrial("ClientSidePreviews", "Enabled"));
   VerifyNewParams();
   variations::testing::ClearAllVariationParams();
 }
 
 }  // namespace previews