Use CTFontCreateForString for RenderTextHarfbuzz on Mac

ui/gfx/font_fallback_mac_unittest.cc

Index: ui/gfx/font_fallback_mac_unittest.cc
diff --git a/ui/gfx/font_fallback_mac_unittest.cc b/ui/gfx/font_fallback_mac_unittest.cc
index ed0c7390cd34d58f73ad8567bd1b6405ffff0d97..8bdea86c271df1b7ee0c3109c0a8378a41f5493d 100644
--- a/ui/gfx/font_fallback_mac_unittest.cc
+++ b/ui/gfx/font_fallback_mac_unittest.cc
@@ -4,6 +4,7 @@
 
 #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"
 
@@ -12,7 +13,7 @@ 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
@@ -20,4 +21,20 @@ GTEST_TEST(FontFallbackMacTest, GetFallbackFonts) {
   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