[translate] Add translate ranker model loader.

components/translate/core/browser/translate_ranker_model_loader.cc

Index: components/translate/core/browser/translate_ranker_model_loader.cc
diff --git a/components/translate/core/browser/translate_ranker_model_loader.cc b/components/translate/core/browser/translate_ranker_model_loader.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c95a62a6e60fb97ea7d057e80aba9f11a677fe86
--- /dev/null
+++ b/components/translate/core/browser/translate_ranker_model_loader.cc
@@ -0,0 +1,21 @@
+// 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_model_loader.h"
+
+namespace translate {
+
+const int TranslateRankerModelTraits::kFetcherId = 2;
+const char TranslateRankerModelTraits::kWriteTimerHistogram[] =
+    "Translate.Ranker.Timer.WriteModel";
+const char TranslateRankerModelTraits::kReadTimerHistogram[] =
+    "Translate.Ranker.Timer.ReadModel";
+const char TranslateRankerModelTraits::kDownloadTimerHistogram[] =
+    "Translate.Ranker.Timer.DownloadModel";
+const char TranslateRankerModelTraits::kParsetimerHistogram[] =
+    "Translate.Ranker.Timer.ParseModel";
+const char TranslateRankerModelTraits::kModelStatusHistogram[] =
+    "Translate.Ranker.Model.Status";
+
+}  // namespace translate