Fix case mapping buffer length divergence for synthetic caps

third_party/WebKit/Source/platform/fonts/shaping/CaseMappingHarfBuzzBufferFiller.h

 // Copyright 2015 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 CaseMappingHarfBuzzBufferFiller_h
 #define CaseMappingHarfBuzzBufferFiller_h
 
 #include "wtf/Allocator.h"
+#include "wtf/text/AtomicString.h"
 #include "wtf/text/Unicode.h"
 
 #include <hb.h>
 
 namespace blink {
 
 enum class CaseMapIntend {
     KeepSameCase,
     UpperCase,
     LowerCase
 };
 
 class CaseMappingHarfBuzzBufferFiller {
     STACK_ALLOCATED()
 
 public:
     CaseMappingHarfBuzzBufferFiller(
         CaseMapIntend,
+        AtomicString locale,
         hb_buffer_t* harfBuzzBuffer,
         const UChar* buffer,
         unsigned bufferLength,
         unsigned startIndex,
         unsigned numCharacters);
 
 private:
+    void fillSlowCase(CaseMapIntend,
+        AtomicString locale,
+        const UChar* buffer,
+        unsigned bufferLength,
+        unsigned startIndex,
+        unsigned numCharacters);
     hb_buffer_t* m_harfBuzzBuffer;
 };
 
 } // namespace blink
 
 #endif