Reland 2: mac: Use a placeholder string for the family name of the system font.

Source/platform/fonts/mac/FontCacheMac.mm

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  *
  * 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.
@@ skipping 64 matching lines @@
     // when running the set of standard non-subpixel layout tests,
     // otherwise use subpixel glyph positioning.
     return (LayoutTestSupport::isRunningLayoutTest() && !LayoutTestSupport::isFontAntialiasingEnabledForTest());
 }
 
 void FontCache::platformInit()
 {
     CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), this, fontCacheRegisteredFontsChangedNotificationCallback, kCTFontManagerRegisteredFontsChangedNotification, 0, CFNotificationSuspensionBehaviorDeliverImmediately);
 }
 
-static int toAppKitFontWeight(FontWeight fontWeight)
-{
-    static int appKitFontWeights[] = {
-        2,  // FontWeight100
-        3,  // FontWeight200
-        4,  // FontWeight300
-        5,  // FontWeight400
-        6,  // FontWeight500
-        8,  // FontWeight600
-        9,  // FontWeight700
-        10, // FontWeight800
-        12, // FontWeight900
-    };
-    return appKitFontWeights[fontWeight];
-}
-
 static inline bool isAppKitFontWeightBold(NSInteger appKitFontWeight)
 {
     return appKitFontWeight >= 7;
 }
 
 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 character, const SimpleFontData* fontDataToSubstitute)
 {
     // FIXME: We should fix getFallbackFamily to take a UChar32
     // and remove this split-to-UChar16 code.
     UChar codeUnits[2];
@@ skipping 36 matching lines @@
         traits = [fontManager traitsOfFont:nsFont];
         if (platformData.m_syntheticBold)
             traits |= NSBoldFontMask;
         if (platformData.m_syntheticItalic)
             traits |= NSFontItalicTrait;
         weight = [fontManager weightOfFont:nsFont];
         size = [nsFont pointSize];
     } else {
         // For custom fonts nsFont is nil.
         traits = fontDescription.style() ? NSFontItalicTrait : 0;
-        weight = toAppKitFontWeight(fontDescription.weight());
+        weight = ToAppKitFontWeight(fontDescription.weight());
         size = fontDescription.computedPixelSize();
     }
 
     NSFontTraitMask substituteFontTraits = [fontManager traitsOfFont:substituteFont];
     NSInteger substituteFontWeight = [fontManager weightOfFont:substituteFont];
 
     if (traits != substituteFontTraits || weight != substituteFontWeight || !nsFont) {
         if (NSFont *bestVariation = [fontManager fontWithFamily:[substituteFont familyName] traits:traits weight:weight size:size]) {
             if ((!nsFont || [fontManager traitsOfFont:bestVariation] != substituteFontTraits || [fontManager weightOfFont:bestVariation] != substituteFontWeight)
                 && [[bestVariation coveredCharacterSet] longCharacterIsMember:character])
@@ skipping 28 matching lines @@
     // the user doesn't have it, we fall back on Lucida Grande because that's
     // guaranteed to be there, according to Nathan Taylor. This is good enough
     // to avoid a crash at least.
     DEFINE_STATIC_LOCAL(AtomicString, lucidaGrandeStr, ("Lucida Grande", AtomicString::ConstructFromLiteral));
     return getFontData(fontDescription, lucidaGrandeStr, false, shouldRetain);
 }
 
 FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const FontFaceCreationParams& creationParams, float fontSize)
 {
     NSFontTraitMask traits = fontDescription.style() ? NSFontItalicTrait : 0;
-    NSInteger weight = toAppKitFontWeight(fontDescription.weight());
     float size = fontSize;
 
-    NSFont *nsFont = MatchNSFontFamily(creationParams.family(),traits, weight, size);
+    NSFont* nsFont = MatchNSFontFamily(creationParams.family(), traits, fontDescription.weight(), size);
     if (!nsFont)
         return 0;
 
     NSFontManager *fontManager = [NSFontManager sharedFontManager];
     NSFontTraitMask actualTraits = 0;
     if (fontDescription.style())
         actualTraits = [fontManager traitsOfFont:nsFont];
     NSInteger actualWeight = [fontManager weightOfFont:nsFont];
 
     NSFont *platformFont = useHinting() ? [nsFont screenFont] : [nsFont printerFont];
-    bool syntheticBold = (isAppKitFontWeightBold(weight) && !isAppKitFontWeightBold(actualWeight)) || fontDescription.isSyntheticBold();
+    NSInteger appKitWeight = ToAppKitFontWeight(fontDescription.weight());
+    bool syntheticBold = (isAppKitFontWeightBold(appKitWeight) && !isAppKitFontWeightBold(actualWeight)) || fontDescription.isSyntheticBold();
     bool syntheticItalic = ((traits & NSFontItalicTrait) && !(actualTraits & NSFontItalicTrait)) || fontDescription.isSyntheticItalic();
 
     // FontPlatformData::typeface() is null in the case of Chromium out-of-process font loading failing.
     // Out-of-process loading occurs for registered fonts stored in non-system locations.
     // When loading fails, we do not want to use the returned FontPlatformData since it will not have
     // a valid SkTypeface.
     OwnPtr<FontPlatformData> platformData = adoptPtr(new FontPlatformData(platformFont, size, syntheticBold, syntheticItalic, fontDescription.orientation()));
     if (!platformData->typeface()) {
         return nullptr;
     }
     return platformData.leakPtr();
 }
 
 } // namespace blink