[iOS] Upstream //ios/net

ios/net/url_scheme_util.mm

+// Copyright 2014 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.
+
+#import "ios/net/url_scheme_util.h"
+
+#import <Foundation/Foundation.h>
+
+#include "base/logging.h"
+#include "base/strings/sys_string_conversions.h"
+#include "url/gurl.h"
+
+namespace net {
+
+bool UrlSchemeIs(NSURL* url, NSString* scheme) {
+  DCHECK([scheme isEqualToString:[scheme lowercaseString]]);
+  NSString* url_scheme = [url scheme];
+  return (url_scheme != nil) &&
+         [url_scheme caseInsensitiveCompare:scheme] == NSOrderedSame;
+}
+
+bool UrlHasDataScheme(NSURL* url) {
+  return UrlSchemeIs(url, base::SysUTF8ToNSString(url::kDataScheme));
+}
+
+}  // namespace net