Use IDWriteFontFallback when available.

src/utils/win/SkDWrite.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDWrite_DEFINED
 #define SkDWrite_DEFINED
 
 #include "SkTemplates.h"
 #include "SkFontStyle.h"
 
 #include <dwrite.h>
 #include <winsdkver.h>
 
 class SkString;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Factory
 
 #ifndef SK_HAS_DWRITE_1_H
 #define SK_HAS_DWRITE_1_H (WINVER_MAXVER >= 0x0602)
 #endif
 
+#ifndef SK_HAS_DWRITE_2_H
+#define SK_HAS_DWRITE_2_H (WINVER_MAXVER >= 0x0603)
+#endif
+
 IDWriteFactory* sk_get_dwrite_factory();
 
 ////////////////////////////////////////////////////////////////////////////////
 // String conversion
 
 /** Prefer to use this type to prevent template proliferation. */
 typedef SkAutoSTMalloc<16, WCHAR> SkSMallocWCHAR;
 
 /** Converts a utf8 string to a WCHAR string. */
 HRESULT sk_cstring_to_wchar(const char* skname, SkSMallocWCHAR* name);
@@ skipping 63 matching lines @@
 
         fWeight = (DWRITE_FONT_WEIGHT)pattern.weight();
         fWidth = (DWRITE_FONT_STRETCH)pattern.width();
     }
     DWRITE_FONT_STYLE fSlant;
     DWRITE_FONT_WEIGHT fWeight;
     DWRITE_FONT_STRETCH fWidth;
 };
 
 #endif