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

components/translate/content/browser/language_model_observer.cc

Index: components/translate/content/browser/language_model_observer.cc
diff --git a/components/translate/content/browser/language_model_observer.cc b/components/translate/content/browser/language_model_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1c6e9f66b65b6ba81f50c68b782561e74b301cac
--- /dev/null
+++ b/components/translate/content/browser/language_model_observer.cc
@@ -0,0 +1,25 @@
+// 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/content/browser/language_model_observer.h"
+
+#include "components/translate/core/browser/language_model.h"
+#include "components/translate/core/common/language_detection_details.h"
+
+namespace translate {
+
+LanguageModelObserver::LanguageModelObserver(
+    translate::LanguageModel* language_model)
+    : language_model_(language_model) {}
+
+LanguageModelObserver::~LanguageModelObserver() {}
+
+void LanguageModelObserver::OnLanguageDetermined(
+    const translate::LanguageDetectionDetails& details) {
+  // Inform the language model about the language detected by CLD.
+  if (details.is_cld_reliable)
+    language_model_->OnPageVisited(details.cld_language);

[droger, 2016/10/05 13:37:26]

Actually you can probably simplify here:
get rid of this class entirely and move these two lines of code to
ChromeTranslateClient::OnLanguageDetermined.

[jkrcal, 2016/10/05 15:14:46]

Done.

+}
+
+}  // namespace translate