[WIP] [url_utils] Implement a contiguous SchemeSet to replace vector<SchemeWithType>

url/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/buildflag_header.gni")
 import("//testing/test.gni")
 import("features.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 buildflag_header("url_features") {
   header = "url_features.h"
   flags = [ "USE_PLATFORM_ICU_ALTERNATIVES=$use_platform_icu_alternatives" ]
 }
 
 component("url") {
   sources = [
     "gurl.cc",
     "gurl.h",
     "origin.cc",
     "origin.h",
     "scheme_host_port.cc",
     "scheme_host_port.h",
+    "scheme_set.cc",
+    "scheme_set.h",
     "third_party/mozilla/url_parse.cc",
     "third_party/mozilla/url_parse.h",
     "url_canon.h",
     "url_canon_etc.cc",
     "url_canon_filesystemurl.cc",
     "url_canon_fileurl.cc",
     "url_canon_host.cc",
     "url_canon_internal.cc",
     "url_canon_internal.h",
     "url_canon_internal_file.h",
@@ skipping 128 matching lines @@
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (!is_ios) {
     deps += [
       "//mojo/edk/system",
       "//mojo/edk/test:test_support",
       "//url/mojo:test_url_mojom_gurl",
     ]
   }
 }