Defer computing localeForHan until needed

third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp

Index: third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp b/third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp
index 5ae67b7cc5ae5b0103f2bab17a1e5c952d6cbc97..0e8e550002ead805236d6367562eb1f70c642985 100644
--- a/third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp
+++ b/third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolver.cpp
@@ -8,11 +8,26 @@
 
 namespace blink {
 
+static String& currentAcceptLanguages()
+{
+    DEFINE_STATIC_LOCAL(String, s_current, ());
+    return s_current;
+}
+
 void AcceptLanguagesResolver::acceptLanguagesChanged(
     const String& acceptLanguages)
 {
-    LayoutLocale::setLocaleForHan(
-        localeForHanFromAcceptLanguages(acceptLanguages));
+    String& currentValue = currentAcceptLanguages();
+    if (currentValue == acceptLanguages)
+        return;
+
+    currentValue = acceptLanguages;
+    LayoutLocale::invalidateLocaleForHan();
+}
+
+const LayoutLocale* AcceptLanguagesResolver::localeForHan()
+{
+    return localeForHanFromAcceptLanguages(currentAcceptLanguages());
 }
 
 const LayoutLocale* AcceptLanguagesResolver::localeForHanFromAcceptLanguages(