[translate] Add translate ranker model loader.

components/translate/core/browser/translate_ranker_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/translate/core/browser/translate_ranker.h"
 
 #include <initializer_list>
 #include <memory>
 
 #include "base/feature_list.h"
@@ skipping 148 matching lines @@
   double expected = Sigmoid(0.5 * 0.02f +  // accept ratio * weight
                             0.5 * 0.03f +  // decline ratio * weight
                             0.0 * 0.00f +  // ignore ratio * (default) weight
                             1.0 * 0.04f +  // one-hot src-language "en" * weight
                             1.0 * 0.00f +  // one-hot dst-language "fr" * weight
                             1.0 * 0.07f +  // one-hot country * weight
                             1.0 * 0.12f +  // one-hot locale * weight
                             0.01f);        // bias
 
   EXPECT_NEAR(expected,
-              ranker->CalculateScore(0.5, 0.5, 0.0, "en", "fr", "zh-CN", "us"),
+              ranker->CalculateScore(ranker->GetSharedModelPtr()->data, 0.5,
+                                     0.5, 0.0, "en", "fr", "zh-CN", "us"),
               0.000001);
 }
 
 TEST_F(TranslateRankerTest, ShouldOfferTranslation) {
   InitFeatures({kTranslateRankerQuery, kTranslateRankerEnforcement}, {});
   // With a bias of -0.5 en->fr is not over the threshold.
   EXPECT_FALSE(GetRankerForTest(-0.5f)->ShouldOfferTranslation(
       *translate_prefs_, "en", "fr"));
   // With a bias of 0.25 en-fr is over the threshold.
   EXPECT_TRUE(GetRankerForTest(0.25f)->ShouldOfferTranslation(*translate_prefs_,
@@ skipping 42 matching lines @@
   ranker->RecordTranslateEvent(event_1);
   ranker->RecordTranslateEvent(event_2);
   ranker->RecordTranslateEvent(event_3);
 
   // Logging is disabled, so no events should be cached.
   ranker->FlushTranslateEvents(&flushed_events);
   EXPECT_EQ(0U, flushed_events.size());
 }
 
 }  // namespace translate