Support sideloaded fonts for DirectWrite

Source/platform/fonts/skia/FontCacheSkia.cpp

Index: Source/platform/fonts/skia/FontCacheSkia.cpp
diff --git a/Source/platform/fonts/skia/FontCacheSkia.cpp b/Source/platform/fonts/skia/FontCacheSkia.cpp
index 67d20f2a9b2404804879089bd91d7c28eb3a7903..2dc0ef2619b6edc0aea15b59f6091c0004592494 100644
--- a/Source/platform/fonts/skia/FontCacheSkia.cpp
+++ b/Source/platform/fonts/skia/FontCacheSkia.cpp
@@ -124,8 +124,14 @@ PassRefPtr<SkTypeface> FontCache::createTypeface(const FontDescription& fontDesc
     if (fontDescription.style())
         style |= SkTypeface::kItalic;
 
-    // FIXME: Use SkFontStyle and matchFamilyStyle instead of legacyCreateTypeface.
 #if OS(WIN)
+    if (s_sideloadedFonts) {
+        HashMap<String, SkTypeface*>::iterator sideloadedFont = s_sideloadedFonts->find(name.data());
+        if (sideloadedFont != s_sideloadedFonts->end()) {
+            return adoptRef(sideloadedFont->value);
+        }
+    }
+    // FIXME: Use SkFontStyle and matchFamilyStyle instead of legacyCreateTypeface.
     if (m_fontManager)
         return adoptRef(m_fontManager->legacyCreateTypeface(name.data(), style));
 #endif