Store glyph bounds in WordMeasurement to avoid slow path width calc

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 25 matching lines @@
 
 namespace blink {
 
 struct WidthCacheEntry {
     WidthCacheEntry()
     {
         width = std::numeric_limits<float>::quiet_NaN();
     }
     bool isValid() const { return !std::isnan(width); }
     float width;
-    FloatRectOutsets glyphBounds;
+    FloatRect glyphBounds;
 };
 
 class WidthCache {
 private:
     // Used to optimize small strings as hash table keys. Avoids malloc'ing an out-of-line StringImpl.
     class SmallStringKey {
     public:
         static unsigned capacity() { return s_capacity; }
 
         SmallStringKey()
@@ skipping 146 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 blink
 
 #endif // WidthCache_h