Allow the default generic font family settings to find the first available font

ui/gfx/font_list.h

Index: ui/gfx/font_list.h
diff --git a/ui/gfx/font_list.h b/ui/gfx/font_list.h
index 432f627bceaa97b31f7c222ecfd5b400b98bdd84..e2c30725e2f4becbb4d09583ac7733dd1ab92309 100644
--- a/ui/gfx/font_list.h
+++ b/ui/gfx/font_list.h
@@ -164,6 +164,12 @@ class GFX_EXPORT FontList {
   // Returns the first font in the list.
   const Font& GetPrimaryFont() const;
 
+  // Returns the first available font name. If there is no available font,
+  // returns the first font name. Empty entries are ignored.
+  // Used by Blink and webui to pick the primary standard/serif/sans/fixed/etc.
+  // fonts from region-specific IDS lists.
+  static std::string FirstAvailableOrFirst(const std::string& font_name_list);
+
  private:
   explicit FontList(FontListImpl* impl);