Use CTFontCreateForString for RenderTextHarfbuzz on Mac

ui/gfx/font_fallback_mac_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/font_fallback.h"
 
+#include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 // A targeted test for GetFallbackFonts on Mac. It uses a system API that
 // only became publicly available in the 10.8 SDK. This test is to ensure it
 // behaves sensibly on all supported OS versions.
-GTEST_TEST(FontFallbackMacTest, GetFallbackFonts) {
+TEST(FontFallbackMacTest, GetFallbackFonts) {
   Font font("Arial", 12);
   std::vector<Font> fallback_fonts = GetFallbackFonts(font);
   // If there is only one fallback, it means the only fallback is the font
   // itself.
   EXPECT_LT(1u, fallback_fonts.size());
 }
 
+// Sanity check GetFallbackFont() behavior on Mac. This test makes assumptions
+// about font properties and availability on specific macOS versions.
+TEST(FontFallbackMacTest, GetFallbackFont) {
+  Font arial("Helvetica", 12);
+  const base::string16 ascii = base::ASCIIToUTF16("abc");
+  const base::string16 hebrew = base::WideToUTF16(L"\x5d0\x5d1\x5d2");
+  const base::string16 emoji = base::UTF8ToUTF16("😋");
+
+  gfx::Font fallback;
+  EXPECT_FALSE(GetFallbackFont(arial, ascii.data(), ascii.size(), &fallback));
+  EXPECT_TRUE(GetFallbackFont(arial, hebrew.data(), hebrew.size(), &fallback));
+  EXPECT_EQ("Lucida Grande", fallback.GetFontName());
+  EXPECT_TRUE(GetFallbackFont(arial, emoji.data(), emoji.size(), &fallback));
+  EXPECT_EQ("Apple Color Emoji", fallback.GetFontName());
+}
+
 }  // namespace gfx