[Intl] Fix special case timezone

Antarctica/DumontDUrville has special casing.

Bug: chromium:928068
Change-Id: I8aea2fafc2c14d6fbfee8a95910df7e8d7d1ff37
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1507329Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60108}

src/objects/js-date-time-format.cc

@@ -269,6 +269,7 @@ char LocaleIndependentAsciiToLower(char ch) {
 // or ho_cHi_minH -> Ho_Chi_Minh. It is locale-agnostic and only
 // deals with ASCII only characters.
 // 'of', 'au' and 'es' are special-cased and lowercased.
+// Also "Antarctica/DumontDUrville" is special case.
 // ICU's timezone parsing is case sensitive, but ECMAScript is case insensitive
 std::string ToTitleCaseTimezoneLocation(Isolate* isolate,
                                         const std::string& input) {
@@ -296,6 +297,10 @@ std::string ToTitleCaseTimezoneLocation(Isolate* isolate,
       return std::string();
     }
   }
+  // Special case
+  if (title_cased == "Antarctica/Dumontdurville") {
+    return "Antarctica/DumontDUrville";
+  }
   return title_cased;
 }
 

test/intl/regress-928068.js

+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+assertDoesNotThrow(
+    ()=>(new Date().toLocaleString(
+        "en-US", {timeZone: "Antarctica/DumontDUrville"})));
+
+assertDoesNotThrow(
+    ()=>(new Date().toLocaleString(
+        "en-US", {timeZone: "antarctica/dumontdurville"})));