Add oblique as a slant.

src/core/SkFontStyle.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontStyle.h"
 #include "SkTypeface.h"
 #include "SkTypes.h"
 
 SkFontStyle::SkFontStyle() {
     fUnion.fU32 = 0;
     fUnion.fR.fWeight = kNormal_Weight;
     fUnion.fR.fWidth = kNormal_Width;
     fUnion.fR.fSlant = kUpright_Slant;
 }
 
 SkFontStyle::SkFontStyle(int weight, int width, Slant slant) {
     fUnion.fU32 = 0;
     fUnion.fR.fWeight = SkTPin<int>(weight, kThin_Weight, kBlack_Weight);
     fUnion.fR.fWidth = SkTPin<int>(width, kUltraCondensed_Width, kUltaExpanded_Width);
-    fUnion.fR.fSlant = SkTPin<int>(slant, kUpright_Slant, kItalic_Slant);
+    fUnion.fR.fSlant = SkTPin<int>(slant, kUpright_Slant, kOblique_Slant);
 }
 
 /*static*/SkFontStyle SkFontStyle::FromOldStyle(unsigned oldStyle) {
     return SkFontStyle((oldStyle & SkTypeface::kBold) ? SkFontStyle::kBold_Weight
                                                       : SkFontStyle::kNormal_Weight,
                        SkFontStyle::kNormal_Width,
                        (oldStyle & SkTypeface::kItalic) ? SkFontStyle::kItalic_Slant
                                                         : SkFontStyle::kUpright_Slant);
 }