Use CTFontCreateForString for RenderTextHarfbuzz on Mac

ui/gfx/font_fallback.h

Index: ui/gfx/font_fallback.h
diff --git a/ui/gfx/font_fallback.h b/ui/gfx/font_fallback.h
index d0d838f9574ac362a5ac6cdb825d2bac5b6d2f7f..2e5d50add67b7ccc85c9624a537e361bcc8cf5a3 100644
--- a/ui/gfx/font_fallback.h
+++ b/ui/gfx/font_fallback.h
@@ -7,6 +7,8 @@
 
 #include <vector>
 
+#include "base/strings/string16.h"
+#include "build/build_config.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/gfx_export.h"
 
@@ -17,6 +19,18 @@ class Font;
 // Given a font, returns the fonts that are suitable for fallback.
 GFX_EXPORT std::vector<Font> GetFallbackFonts(const Font& font);
 
+#if defined(OS_MACOSX) || defined(OS_WIN)
+
+// Finds a fallback font to render the specified |text| with respect to an
+// initial |font|. Returns the resulting font via out param |result|. Returns
+// |true| if a fallback font was found.
+bool GFX_EXPORT GetFallbackFont(const Font& font,
+                                const base::char16* text,
+                                int text_length,
+                                Font* result);
+
+#endif
+
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_FALLBACK_H_