predictors: Disable URL-based learning by default.

chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer_unittest.cc

 // Copyright 2017 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/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h"
 
+#include <memory>
+
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using predictors::ResourcePrefetchPredictor;
 
 class MockResourcePrefetchPredictor : public ResourcePrefetchPredictor {
  public:
   MockResourcePrefetchPredictor(
       const predictors::ResourcePrefetchPredictorConfig& config,
       Profile* profile)
       : ResourcePrefetchPredictor(config, profile) {}
 
   MOCK_METHOD1(IsUrlPrefetchable, bool(const GURL& main_frame_url));
 
   ~MockResourcePrefetchPredictor() override {}
 };
 
 class ResourcePrefetchPredictorPageLoadMetricsObserverTest
     : public page_load_metrics::PageLoadMetricsObserverTestHarness {
  protected:
   void SetUp() override {
     page_load_metrics::PageLoadMetricsObserverTestHarness::SetUp();
     predictors::ResourcePrefetchPredictorConfig config;
-    config.mode = predictors::ResourcePrefetchPredictorConfig::LEARNING;
+    config.mode = predictors::ResourcePrefetchPredictorConfig::HOST_LEARNING;
     predictor_ =
         base::MakeUnique<testing::StrictMock<MockResourcePrefetchPredictor>>(
             config, profile());
     timing_.navigation_start = base::Time::FromDoubleT(1);
     timing_.first_paint = base::TimeDelta::FromSeconds(2);
     timing_.first_contentful_paint = base::TimeDelta::FromSeconds(3);
     timing_.first_meaningful_paint = base::TimeDelta::FromSeconds(4);
     PopulateRequiredTimingFields(&timing_);
   }
 
@@ skipping 30 matching lines @@
       .WillOnce(testing::Return(false));
 
   NavigateAndCommit(main_frame_url);
   SimulateTimingUpdate(timing_);
 
   histogram_tester().ExpectTotalCount(
       internal::kHistogramResourcePrefetchPredictorFirstContentfulPaint, 0);
   histogram_tester().ExpectTotalCount(
       internal::kHistogramResourcePrefetchPredictorFirstMeaningfulPaint, 0);
 }