Add ability to pass through IDWriteFactory so sandbox can control how it's constructed

Source/platform/fonts/FontCache.h

 /*
  * Copyright (C) 2006, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 27 matching lines @@
 #include "wtf/Vector.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/WTFString.h"
 #include "wtf/unicode/Unicode.h"
 
 #if OS(WIN)
 #include "SkFontMgr.h"
 #include <windows.h>
 #include <objidl.h>
 #include <mlang.h>
+struct IDWriteFactory;
 #endif
 
 #if OS(ANDROID)
 #include <unicode/uscript.h>
 #endif
 
 class SkTypeface;
 
 namespace WebCore {
 
@@ skipping 35 matching lines @@
     void invalidate();
 
 #if OS(WIN)
     PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, wchar_t* outFontFamilyName);
 #endif
 
 #if OS(WIN)
     bool useSubpixelPositioning() const { return s_useSubpixelPositioning; }
     SkFontMgr* fontManager() { return m_fontManager.get(); }
     static void setUseDirectWrite(bool useDirectWrite) { s_useDirectWrite = useDirectWrite; }
+    static void setDirectWriteFactory(IDWriteFactory* factory) { s_directWriteFactory = factory; }
     static void setUseSubpixelPositioning(bool useSubpixelPositioning) { s_useSubpixelPositioning = useSubpixelPositioning; }
 #endif
 
 #if ENABLE(OPENTYPE_VERTICAL)
     typedef uint32_t FontFileKey;
     PassRefPtr<OpenTypeVerticalData> getVerticalData(const FontFileKey&, const FontPlatformData&);
 #endif
 
 #if OS(ANDROID)
     static AtomicString getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode);
@@ skipping 30 matching lines @@
     PassRefPtr<SkTypeface> createTypeface(const FontDescription&, const AtomicString& family, CString& name);
 
     PassRefPtr<SimpleFontData> fontDataFromFontPlatformData(const FontPlatformData*, ShouldRetain = Retain);
 
     // Don't purge if this count is > 0;
     int m_purgePreventCount;
 
 #if OS(WIN)
     OwnPtr<SkFontMgr> m_fontManager;
     static bool s_useDirectWrite;
+    static IDWriteFactory* s_directWriteFactory;
     static bool s_useSubpixelPositioning;
 #endif
 
 #if OS(MACOSX) || OS(ANDROID)
     friend class ComplexTextController;
 #endif
     friend class SimpleFontData; // For fontDataFromFontPlatformData
     friend class FontFallbackList;
 };
 
 class PLATFORM_EXPORT FontCachePurgePreventer {
 public:
     FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
     ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 }
 
 #endif