Improve CSS Style matching spec compliance

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 354 matching lines @@
 
         } else {
             return 0;
         }
     }
 
     FontPlatformData* result = new FontPlatformData(tf,
         name.data(),
         fontSize,
         (fontDescription.weight() >= FontWeight600 && !tf->isBold()) || fontDescription.isSyntheticBold(),
-        (fontDescription.style() == FontStyleItalic && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
+        ((fontDescription.style() == FontStyleItalic || fontDescription.style() == FontStyleOblique) && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
         fontDescription.orientation(),
         s_useSubpixelPositioning);
 
     struct FamilyMinSize {
         const wchar_t* family;
         unsigned minSize;
     };
     const static FamilyMinSize minAntiAliasSizeForFont[] = {
         { L"simsun", 11 },
         { L"dotum", 12 },
@@ skipping 33 matching lines @@
         if (typefacesMatchesFamily(tf.get(), family)) {
             result->setMinSizeForSubpixel(minSizeForSubpixelForFont);
             break;
         }
     }
 
     return result;
 }
 
 } // namespace blink