Expand WidthCache for complex text width queries

Source/platform/fonts/WidthCache.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 101 matching lines @@
 
     friend bool operator==(const SmallStringKey&, const SmallStringKey&);
 
 public:
     WidthCache()
         : m_interval(s_maxInterval)
         , m_countdown(m_interval)
     {
     }
 
-    float* add(const TextRun& run, float entry, bool hasKerningOrLigatures, bool hasWordSpacingOrLetterSpacing, GlyphOverflow* glyphOverflow)
+    float* add(const TextRun& run, float entry, bool hasWordSpacingOrLetterSpacing, GlyphOverflow* glyphOverflow)
     {
-        // The width cache is not really profitable unless we're doing expensive glyph transformations.
-        if (!hasKerningOrLigatures)
-            return 0;
         // Word spacing and letter spacing can change the width of a word.
         if (hasWordSpacingOrLetterSpacing)
             return 0;
         // Since this is just a width cache, we don't have enough information to satisfy glyph queries.
-        if (glyphOverflow)
+        if (glyphOverflow) {
             return 0;
+        }
         // If we allow tabs and a tab occurs inside a word, the width of the word varies based on its position on the line.
         if (run.allowTabs())
             return 0;
         if (static_cast<unsigned>(run.length()) > SmallStringKey::capacity())
             return 0;
 
         if (m_countdown > 0) {
             --m_countdown;
             return 0;
         }
@@ skipping 64 matching lines @@
 inline bool operator==(const WidthCache::SmallStringKey& a, const WidthCache::SmallStringKey& b)
 {
     if (a.length() != b.length())
         return false;
     return WTF::equal(a.characters(), b.characters(), a.length());
 }
 
 } // namespace WebCore
 
 #endif // WidthCache_h