Check hyphenation alias before opening dictionary

This patch checks hyphenation alias first, before trying to
open dictionaries. When the `lang` attribute is aliases,
this change can reduce one IPC call.

Bug: 1116540
Change-Id: I2ffe71a7f7c063238545320b538474e0e03307b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358714Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798523}

third_party/blink/renderer/platform/text/hyphenation/hyphenation_minikin.cc

@@ -183,17 +183,16 @@ static LocaleMap CreateLocaleFallbackMap() {
 
 scoped_refptr<Hyphenation> Hyphenation::PlatformGetHyphenation(
     const AtomicString& locale) {
-  scoped_refptr<HyphenationMinikin> hyphenation(
-      base::AdoptRef(new HyphenationMinikin));
-  if (hyphenation->OpenDictionary(locale.LowerASCII()))
-    return hyphenation;
-  hyphenation = nullptr;
-
   DEFINE_STATIC_LOCAL(LocaleMap, locale_fallback, (CreateLocaleFallbackMap()));
   const auto& it = locale_fallback.find(locale);
   if (it != locale_fallback.end())
     return LayoutLocale::Get(it->value)->GetHyphenation();
 
+  scoped_refptr<HyphenationMinikin> hyphenation(
+      base::AdoptRef(new HyphenationMinikin));
+  if (hyphenation->OpenDictionary(locale.LowerASCII()))
+    return hyphenation;
+
   return nullptr;
 }