[Payment Request] Update the CurrencyStringFormatter to call the native impl.

components/payments/android/currency_formatter_android.h

+// Copyright 2017 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.
+
+#ifndef COMPONENTS_PAYMENTS_ANDROID_CURRENCY_FORMATTER_ANDROID_H_
+#define COMPONENTS_PAYMENTS_ANDROID_CURRENCY_FORMATTER_ANDROID_H_
+
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "components/payments/currency_formatter.h"
+
+namespace payments {
+
+// Forwarding calls to payments::CurrencyFormatter.
+class CurrencyFormatterAndroid {
+ public:
+  CurrencyFormatterAndroid(
+      JNIEnv* env,
+      jobject unused_obj,
+      const base::android::JavaParamRef<jstring>& currency_code,
+      const base::android::JavaParamRef<jstring>& currency_system,
+      const base::android::JavaParamRef<jstring>& locale_name);
+  ~CurrencyFormatterAndroid();
+
+  // Message from Java to destroy this object.
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+
+  // Refer to CurrencyFormatter::Format documentation.
+  base::android::ScopedJavaLocalRef<jstring> Format(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& unused_obj,
+      const base::android::JavaParamRef<jstring>& amount);
+
+  base::android::ScopedJavaLocalRef<jstring> GetFormattedCurrencyCode(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& unused_obj);
+
+  // Registers the JNI bindings for this class.
+  static bool Register(JNIEnv* env);
+
+ private:
+  std::unique_ptr<CurrencyFormatter> currency_formatter_;
+
+  DISALLOW_COPY_AND_ASSIGN(CurrencyFormatterAndroid);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_ANDROID_CURRENCY_FORMATTER_ANDROID_H_