Improve fallback for Burmese with leading punctuation + spacing mark

third_party/WebKit/Source/platform/fonts/FontFallbackIterator.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 FontFallbackIterator_h
 #define FontFallbackIterator_h
 
 #include "platform/fonts/FontDataForRangeSet.h"
 #include "platform/fonts/FontFallbackPriority.h"
 #include "wtf/HashMap.h"
@@ skipping 33 matching lines @@
   bool rangeSetContributesForHint(const Vector<UChar32> hintList,
                                   const FontDataForRangeSet*);
   bool alreadyLoadingRangeForHintChar(UChar32 hintChar);
   void willUseRange(const AtomicString& family, const FontDataForRangeSet&);
 
   PassRefPtr<FontDataForRangeSet> uniqueOrNext(
       PassRefPtr<FontDataForRangeSet> candidate,
       const Vector<UChar32>& hintList);
 
   PassRefPtr<SimpleFontData> fallbackPriorityFont(UChar32 hint);
-  PassRefPtr<SimpleFontData> uniqueSystemFontForHint(UChar32 hint);
+  PassRefPtr<SimpleFontData> uniqueSystemFontForHintList(
+      const Vector<UChar32>& hintList);
 
   const FontDescription& m_fontDescription;
   RefPtr<FontFallbackList> m_fontFallbackList;
   int m_currentFontDataIndex;
   unsigned m_segmentedFaceIndex;
 
   enum FallbackStage {
     FallbackPriorityFonts,
     FontGroupFonts,
     SegmentedFace,
@@ skipping 10 matching lines @@
   // as returning a duplicate value causes a shaping run that won't return any
   // results.
   HashSet<uint32_t> m_uniqueFontDataForRangeSetsReturned;
   Vector<RefPtr<FontDataForRangeSet>> m_trackedLoadingRangeSets;
   FontFallbackPriority m_fontFallbackPriority;
 };
 
 }  // namespace blink
 
 #endif