Add LanguageModel, a keyed service that collects language info from CLD.

chrome/browser/translate/language_model_factory.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/translate/language_model_factory.h"
+
+#include "base/macros.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "components/translate/core/browser/language_model.h"
+
+// static
+LanguageModelFactory*
+LanguageModelFactory::GetInstance() {
+  return base::Singleton<LanguageModelFactory>::get();
+}
+
+// static
+translate::LanguageModel* LanguageModelFactory::GetForBrowserContext(
+    content::BrowserContext* browser_context) {
+  return static_cast<translate::LanguageModel*>(
+      GetInstance()->BuildServiceInstanceFor(browser_context));
+}
+
+LanguageModelFactory::LanguageModelFactory()
+    : BrowserContextKeyedServiceFactory(
+          "LanguageModel",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+LanguageModelFactory::~LanguageModelFactory() {}
+
+KeyedService* LanguageModelFactory::BuildServiceInstanceFor(
+    content::BrowserContext* browser_context) const {
+  Profile* profile = Profile::FromBrowserContext(browser_context);
+  return new translate::LanguageModel(profile->GetPrefs());
+}