For font weights >= 600, create bold system fonts.

Source/platform/fonts/skia/FontCacheSkia.cpp

 /*
  * Copyright (c) 2006, 2007, 2008, 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 58 matching lines @@
     const FontDescription& fontDescription, UChar32 character)
 {
     FontDescription substituteDescription(fontDescription);
     substituteDescription.setStyle(FontStyleNormal);
     substituteDescription.setWeight(FontWeightNormal);
 
     FontFaceCreationParams creationParams(substituteDescription.family().family());
     FontPlatformData* substitutePlatformData = getFontPlatformData(substituteDescription, creationParams);
     if (substitutePlatformData && substitutePlatformData->fontContainsCharacter(character)) {
         FontPlatformData platformData = FontPlatformData(*substitutePlatformData);
-        platformData.setSyntheticBold(fontDescription.weight() >= FontWeightBold);
+        platformData.setSyntheticBold(fontDescription.weight() >= FontWeight600);
         platformData.setSyntheticItalic(fontDescription.style() == FontStyleItalic);
         return fontDataFromFontPlatformData(&platformData, DoNotRetain);
     }
 
     return nullptr;
 }
 
 #if !OS(WIN) && !OS(ANDROID)
 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
 {
     // First try the specified font with standard style & weight.
     if (fontDescription.style() == FontStyleItalic
-        || fontDescription.weight() >= FontWeightBold) {
+        || fontDescription.weight() >= FontWeight600) {
         RefPtr<SimpleFontData> fontData = fallbackOnStandardFontStyle(
             fontDescription, c);
         if (fontData)
             return fontData;
     }
 
     icu::Locale locale = icu::Locale::getDefault();
     FontCache::PlatformFallbackFont fallbackFont;
     FontCache::getFontForCharacter(c, locale.getLanguage(), &fallbackFont);
     if (fallbackFont.name.isEmpty())
@@ skipping 72 matching lines @@
     // If we're creating a fallback font (e.g. "-webkit-monospace"), convert the name into
     // the fallback name (like "monospace") that fontconfig understands.
     if (!family.length() || family.startsWith("-webkit-")) {
         name = getFallbackFontFamily(fontDescription).string().utf8();
     } else {
         // convert the name to utf8
         name = family.utf8();
     }
 
     int style = SkTypeface::kNormal;
-    if (fontDescription.weight() >= FontWeightBold)
+    if (fontDescription.weight() >= FontWeight600)
         style |= SkTypeface::kBold;
     if (fontDescription.style())
         style |= SkTypeface::kItalic;
 
 #if OS(WIN)
     if (s_sideloadedFonts) {
         HashMap<String, SkTypeface*>::iterator sideloadedFont = s_sideloadedFonts->find(name.data());
         if (sideloadedFont != s_sideloadedFonts->end()) {
             return adoptRef(sideloadedFont->value);
         }
@@ skipping 10 matching lines @@
 FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const FontFaceCreationParams& creationParams, float fontSize)
 {
     CString name;
     RefPtr<SkTypeface> tf(createTypeface(fontDescription, creationParams, name));
     if (!tf)
         return 0;
 
     FontPlatformData* result = new FontPlatformData(tf,
         name.data(),
         fontSize,
-        (fontDescription.weight() >= FontWeightBold && !tf->isBold()) || fontDescription.isSyntheticBold(),
+        (fontDescription.weight() >= FontWeight600 && !tf->isBold()) || fontDescription.isSyntheticBold(),
         (fontDescription.style() && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
         fontDescription.orientation(),
         fontDescription.useSubpixelPositioning());
     return result;
 }
 #endif // !OS(WIN)
 
 } // namespace WebCore