Set the font family for the "system-ui" generic font family on Linux

third_party/WebKit/Source/platform/fonts/win/FontCacheSkiaWin.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Computer, Inc.
  * Copyright (c) 2006, 2007, 2008, 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 59 matching lines @@
 void FontCache::addSideloadedFontForTesting(SkTypeface* typeface)
 {
     if (!s_sideloadedFonts)
         s_sideloadedFonts = new HashMap<String, sk_sp<SkTypeface>>;
     SkString name;
     typeface->getFamilyName(&name);
     s_sideloadedFonts->set(name.c_str(), sk_sp<SkTypeface>(typeface));
 }
 
 // static
+const AtomicString& FontCache::systemFontFamily()
+{
+    return *s_menuFontFamilyName;
+}
+
+// static
 void FontCache::setMenuFontMetrics(const wchar_t* familyName, int32_t fontHeight)
 {
     s_menuFontFamilyName = new AtomicString(familyName);
     s_menuFontHeight = ensureMinimumFontHeightIfNeeded(fontHeight);
 }
 
 // static
 void FontCache::setSmallCaptionFontMetrics(const wchar_t* familyName, int32_t fontHeight)
 {
     s_smallCaptionFontFamilyName = new AtomicString(familyName);
@@ skipping 354 matching lines @@
         if (typefacesMatchesFamily(tf.get(), family)) {
             result->setMinSizeForSubpixel(minSizeForSubpixelForFont);
             break;
         }
     }
 
     return result;
 }
 
 } // namespace blink