[DirectWrite] Force fully aliased text for certain fonts at small sizes

Source/platform/fonts/win/FontCacheSkiaWin.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Computer, Inc.
  * Copyright (c) 2006, 2007, 2008, 2009, 2012 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.
@@ skipping 207 matching lines @@
     }
 
     FontPlatformData* result = new FontPlatformData(tf,
         name.data(),
         fontSize,
         fontDescription.weight() >= FontWeightBold && !tf->isBold() || fontDescription.isSyntheticBold(),
         fontDescription.style() == FontStyleItalic && !tf->isItalic() || fontDescription.isSyntheticItalic(),
         fontDescription.orientation(),
         s_useSubpixelPositioning);
 
+    struct FamilyMinSize {
+        const wchar_t* family;
+        unsigned minSize;
+    };
+    const static FamilyMinSize minAntiAliasSizeForFont[] = {
+        { L"simsun", 16 },
+        { L"dotum", 12 }
+    };
+    size_t numFonts = WTF_ARRAY_LENGTH(minAntiAliasSizeForFont);
+    for (size_t i = 0; i < numFonts; i++) {
+        FamilyMinSize entry = minAntiAliasSizeForFont[i];
+        if (typefacesMatchesFamily(tf.get(), entry.family)) {
+            result->setMinSizeForAntiAlias(entry.minSize);
+            break;
+        }
+    }
+
     return result;
 }
 
 }