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

third_party/WebKit/Source/platform/fonts/android/FontCacheAndroid.cpp

 /*
  * Copyright (c) 2011 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 #include "platform/Language.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontFaceCreationParams.h"
 #include "third_party/skia/include/core/SkTypeface.h"
 #include "third_party/skia/include/ports/SkFontMgr.h"
 
 namespace blink {
 
+// static
+const AtomicString& FontCache::systemFontFamily()
+{
+    DEFINE_STATIC_LOCAL(AtomicString, systemFontFamilyName, ());
+    return systemFontFamilyName;
+}
+
+// static
+void FontCache::setSystemFontFamily(const char* familyName)
+{
+    NOTREACHED();
+}
+
 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*, FontFallbackPriority fallbackPriority)
 {
     sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
     AtomicString familyName = getFamilyNameForCharacter(fm.get(), c, fontDescription, fallbackPriority);
     if (familyName.isEmpty())
         return getLastResortFallbackFont(fontDescription, DoNotRetain);
     return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)), DoNotRetain);
 }
 
 // static
@@ skipping 23 matching lines @@
     default:
         // For other scripts, use the default generic family mapping logic.
         return familyName;
     }
 
     sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
     return getFamilyNameForCharacter(fm.get(), examplerChar, fontDescription, FontFallbackPriority::Text);
 }
 
 } // namespace blink