[iOS] Upstream //ios/chrome/browser/signin/signin_util

ios/public/provider/chrome/browser/signin/signin_error_provider.mm

+// 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 "ios/public/provider/chrome/browser/signin/signin_error_provider.h"
+
+namespace ios {
+
+namespace {
+SigninErrorProvider* g_signin_error_provider = nullptr;
+}
+
+void SetSigninErrorProvider(SigninErrorProvider* provider) {
+  g_signin_error_provider = provider;
+}
+
+SigninErrorProvider* GetSigninErrorProvider() {
+  return g_signin_error_provider;
+}
+
+SigninErrorProvider::SigninErrorProvider() {}
+
+SigninErrorProvider::~SigninErrorProvider() {}
+
+SigninErrorCategory SigninErrorProvider::GetErrorCategory(NSError* error) {
+  return SigninErrorCategory::UNKNOWN_ERROR;
+}
+
+bool SigninErrorProvider::IsCanceled(NSError* error) {
+  return false;
+}
+
+NSString* SigninErrorProvider::GetInvalidGrantJsonErrorKey() {
+  return @"invalid_grant_error_key";
+}
+
+NSString* SigninErrorProvider::GetSigninErrorDomain() {
+  return @"signin_error_domain";
+}
+
+int SigninErrorProvider::GetCode(SigninError error) {
+  return 0;
+}
+
+}  // namesace ios