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

ios/chrome/browser/signin/signin_util.mm

+// Copyright 2013 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/chrome/browser/signin/signin_util.h"
+
+#include "base/strings/sys_string_conversions.h"
+#include "google_apis/gaia/gaia_auth_util.h"
+#import "ios/public/provider/chrome/browser/signin/chrome_identity.h"
+#include "ios/public/provider/chrome/browser/signin/signin_error_provider.h"
+
+NSArray* GetScopeArray(const std::set<std::string>& scopes) {
+  NSMutableArray* scopes_array = [[[NSMutableArray alloc] init] autorelease];
+  for (const auto& scope : scopes) {
+    [scopes_array addObject:base::SysUTF8ToNSString(scope)];
+  }
+  return scopes_array;
+}
+
+std::string GetCanonicalizedEmailForIdentity(ChromeIdentity* identity) {
+  NSString* nsEmail = [identity userEmail];
+  if (!nsEmail)
+    return std::string();
+  std::string email = base::SysNSStringToUTF8(nsEmail);
+  return gaia::CanonicalizeEmail(gaia::SanitizeEmail(email));
+}
+
+bool ShouldHandleSigninError(NSError* error) {
+  ios::SigninErrorProvider* provider = ios::GetSigninErrorProvider();
+  return ![provider->GetSigninErrorDomain() isEqualToString:error.domain] ||
+         (error.code != provider->GetCode(ios::SigninError::CANCELED) &&
+          error.code !=
+              provider->GetCode(ios::SigninError::HANDLED_INTERNALLY));
+}