[translate] Add translate ranker model loader.

components/translate/core/browser/mock_translate_ranker.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/mock_translate_ranker.h"
+
+#include "components/metrics/proto/translate_event.pb.h"
+
+namespace translate {
+namespace testing {
+
+MockTranslateRanker::MockTranslateRanker() {}
+
+MockTranslateRanker::~MockTranslateRanker() {}
+
+bool MockTranslateRanker::IsEnabled() {
+  return IsQueryEnabled() || IsEnforcementEnabled();
+}
+
+bool MockTranslateRanker::IsLoggingEnabled() {
+  return is_logging_enabled_;
+}
+
+bool MockTranslateRanker::IsQueryEnabled() {
+  return is_query_enabled_;
+}
+
+bool MockTranslateRanker::IsEnforcementEnabled() {
+  return is_enforcement_enabled_;
+}
+
+int MockTranslateRanker::GetModelVersion() const {
+  return model_version_;
+}
+
+bool MockTranslateRanker::ShouldOfferTranslation(
+    const TranslatePrefs& /* translate_prefs */,
+    const std::string& /* src_lang */,
+    const std::string& /* dst_lang */) {
+  return should_offer_translation_;
+}
+
+void MockTranslateRanker::AddTranslateEvent(
+    std::unique_ptr<metrics::TranslateEventProto> translate_event) {
+  event_cache_.push_back(std::move(translate_event));
+}
+
+void MockTranslateRanker::FlushTranslateEvents(
+    std::vector<std::unique_ptr<metrics::TranslateEventProto>>* events) {
+  events->swap(event_cache_);
+  event_cache_.clear();
+}
+
+}  // namespace testing
+}  // namespace translate