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

third_party/WebKit/Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 2460 matching lines @@
     frame()->document()->clearFocusedElement();
     frame()->page()->focusController().setInitialFocus(reverse ? WebFocusTypeBackward : WebFocusTypeForward);
 }
 
 bool Internals::ignoreLayoutWithPendingStylesheets(Document* document)
 {
     ASSERT(document);
     return document->ignoreLayoutWithPendingStylesheets();
 }
 
+const String& Internals::systemFontFamily() const
+{
+    return FontCache::systemFontFamily();
+}
+
 void Internals::setNetworkConnectionInfoOverride(bool onLine, const String& type, double downlinkMaxMbps, ExceptionState& exceptionState)
 {
     WebConnectionType webtype;
     if (type == "cellular2g") {
         webtype = WebConnectionTypeCellular2G;
     } else if (type == "cellular3g") {
         webtype = WebConnectionTypeCellular3G;
     } else if (type == "cellular4g") {
         webtype = WebConnectionTypeCellular4G;
     } else if (type == "bluetooth") {
@@ skipping 211 matching lines @@
 
     return ClientRect::create(FloatRect(node->layoutObject()->visualRect()));
 }
 
 void Internals::crash()
 {
     CHECK(false) << "Intentional crash";
 }
 
 } // namespace blink