[Sync] Add auto-generated ModelType in Java.

sync/android/model_type_helper.cc

Index: sync/android/model_type_helper.cc
diff --git a/sync/android/model_type_helper.cc b/sync/android/model_type_helper.cc
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+// Copyright 2015 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 "sync/android/model_type_helper.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "jni/ModelTypeHelper_jni.h"
+#include "sync/internal_api/public/base/model_type.h"
+
+namespace syncer {
+
+static jstring ModelTypeToNotificationType(JNIEnv* env,
+                                           jclass clazz,
+                                           jint model_type_int) {
+  std::string model_type_string;
+  ModelType model_type = static_cast<ModelType>(model_type_int);
+  if (!RealModelTypeToNotificationType(model_type, &model_type_string)) {
+    NOTREACHED() << "No string representation of model type " << model_type;
+  }
+  return base::android::ConvertUTF8ToJavaString(env, model_type_string)
+      .Release();
+}
+
+bool RegisterModelTypeHelperJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace syncer