Change the system font fallback to take lang attributes into account on Windows

third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp

Index: third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp b/third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp
index 7076d9c1d91c88183559edc8e41fae76f2b2bf60..cadfc4bb7bfaae9970381c5f004b88ad743c519c 100644
--- a/third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp
+++ b/third_party/WebKit/Source/platform/fonts/win/FontFallbackWinTest.cpp
@@ -36,4 +36,28 @@ TEST(FontFallbackWinTest, scriptCodeForUnifiedHanFromLocaleTest)
         icu::Locale("zh", "hant")));
 }
 
+TEST(FontFallbackWinTest, scriptCodeForUnifiedHanFromSubtagsTest)
+{
+    EXPECT_EQ(USCRIPT_SIMPLIFIED_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-CN"));
+    EXPECT_EQ(USCRIPT_HIRAGANA, scriptCodeForUnifiedHanFromSubtags("en-JP"));
+    EXPECT_EQ(USCRIPT_HANGUL, scriptCodeForUnifiedHanFromSubtags("en-KR"));
+    EXPECT_EQ(USCRIPT_TRADITIONAL_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-HK"));
+    EXPECT_EQ(USCRIPT_TRADITIONAL_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-TW"));
+
+    EXPECT_EQ(USCRIPT_SIMPLIFIED_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-HanS"));
+    EXPECT_EQ(USCRIPT_TRADITIONAL_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-HanT"));
+
+    EXPECT_EQ(USCRIPT_SIMPLIFIED_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-HanS-JP"));
+    EXPECT_EQ(USCRIPT_TRADITIONAL_HAN,
+        scriptCodeForUnifiedHanFromSubtags("en-HanT-JP"));
+
+    EXPECT_EQ(USCRIPT_HAN, scriptCodeForUnifiedHanFromSubtags("en-US"));
+}
+
 } // namespace blink