Add oblique as a slant.

src/ports/SkFontMgr_custom.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkFontMgr.h"
@@ skipping 131 matching lines @@
     }
 
     SkTypeface* createTypeface(int index) override {
         SkASSERT(index < fStyles.count());
         return SkRef(fStyles[index].get());
     }
 
     static int match_score(const SkFontStyle& pattern, const SkFontStyle& candidate) {
         int score = 0;
         score += (pattern.width() - candidate.width()) * 100;
-        score += (pattern.isItalic() == candidate.isItalic()) ? 0 : 1000;
+        score += (pattern.slant() == candidate.slant()) ? 0 : 1000;
         score += pattern.weight() - candidate.weight();
         return score;
     }
 
     SkTypeface* matchStyle(const SkFontStyle& pattern) override {
         if (0 == fStyles.count()) {
             return nullptr;
         }
 
         SkTypeface_Custom* closest = fStyles[0];
@@ skipping 348 matching lines @@
         SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
         families->push_back().reset(family);
         family->appendTypeface(new SkTypeface_Empty);
     }
 
 };
 
 SK_API SkFontMgr* SkFontMgr_New_Custom_Empty() {
     return new SkFontMgr_Custom(EmptyFontLoader());
 }