Defer computing localeForHan until needed

third_party/WebKit/Source/platform/LayoutLocale.h

 // 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.
 
 #ifndef LayoutLocale_h
 #define LayoutLocale_h
 
 #include "platform/PlatformExport.h"
 #include "platform/text/Hyphenation.h"
 #include "wtf/Forward.h"
@@ skipping 24 matching lines @@
     CString ascii() const { return m_string.ascii(); }
 
     const hb_language_impl_t* harfbuzzLanguage() const { return m_harfbuzzLanguage; }
     const char* localeForSkFontMgr() const;
     UScriptCode script() const { return m_script; }
 
     // Disambiguation of the Unified Han Ideographs.
     UScriptCode scriptForHan() const;
     bool hasScriptForHan() const;
     static const LayoutLocale* localeForHan(const LayoutLocale*);
-    static void setLocaleForHan(const LayoutLocale*);
+    static void invalidateLocaleForHan() { s_defaultForHanComputed = false; }
     const char* localeForHanForSkFontMgr() const;
 
     Hyphenation* getHyphenation() const;
 
     static PassRefPtr<LayoutLocale> createForTesting(const AtomicString&);
     static void clearForTesting();
     static void setHyphenationForTesting(const AtomicString&, PassRefPtr<Hyphenation>);
 
 private:
     explicit LayoutLocale(const AtomicString&);
 
     void computeScriptForHan() const;
+    static void computeLocaleForHan();
 
     AtomicString m_string;
     mutable CString m_stringForSkFontMgr;
     mutable RefPtr<Hyphenation> m_hyphenation;
 
     // hb_language_t is defined in hb.h, which not all files can include.
     const hb_language_impl_t* m_harfbuzzLanguage;
 
     UScriptCode m_script;
     mutable UScriptCode m_scriptForHan;
 
     mutable unsigned m_hasScriptForHan : 1;
     mutable unsigned m_hyphenationComputed : 1;
 
     static const LayoutLocale* s_default;
     static const LayoutLocale* s_system;
     static const LayoutLocale* s_defaultForHan;
     static bool s_defaultForHanComputed;
 };
 
 } // namespace blink
 
 #endif // LayoutLocale_h