Enable hyphens: auto and none in BreakingContext

third_party/WebKit/Source/platform/text/Hyphenation.cpp

 // Copyright 2016 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 "platform/text/Hyphenation.h"
 
 #include "wtf/text/StringView.h"
 
 namespace blink {
 
 Hyphenation::HyphenationMap& Hyphenation::getHyphenationMap()
 {
     DEFINE_STATIC_LOCAL(HyphenationMap, hyphenationMap, ());
     return hyphenationMap;
 }
 
 Hyphenation* Hyphenation::get(const AtomicString& locale)
 {
+    DCHECK(!locale.isNull());
     Hyphenation::HyphenationMap& hyphenationMap = getHyphenationMap();
     auto result = hyphenationMap.add(locale, nullptr);
     if (result.isNewEntry)
         result.storedValue->value = platformGetHyphenation(locale);
     return result.storedValue->value.get();
 }
 
 void Hyphenation::setForTesting(const AtomicString& locale, PassRefPtr<Hyphenation> hyphenation)
 {
     getHyphenationMap().set(locale, hyphenation);
 }
 
 void Hyphenation::clearForTesting()
 {
     getHyphenationMap().clear();
 }
 
 } // namespace blink