Take Accept-Language into account in CJK font fallback for Android/Win

third_party/WebKit/Source/platform/fonts/AcceptLanguagesResolverTest.cpp

+// Copyright 2016 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 "platform/fonts/AcceptLanguagesResolver.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(AcceptLanguagesResolverTest, AcceptLanguagesChanged)
+{
+    struct {
+        const char* acceptLanguages;
+        UScriptCode script;
+        const char* locale;
+    } tests[] = {
+        // Non-Han script cases.
+        { "", USCRIPT_COMMON, nullptr },
+        { "en-US", USCRIPT_COMMON, nullptr },
+        { ",en-US", USCRIPT_COMMON, nullptr },
+
+        // Single value cases.
+        { "ja-JP", USCRIPT_KATAKANA_OR_HIRAGANA, "ja-jp" },
+        { "ko-KR", USCRIPT_HANGUL, "ko-kr" },
+        { "zh-CN", USCRIPT_SIMPLIFIED_HAN, "zh-Hans" },
+        { "zh-HK", USCRIPT_TRADITIONAL_HAN, "zh-Hant" },
+        { "zh-TW", USCRIPT_TRADITIONAL_HAN, "zh-Hant" },
+
+        // Unusual combinations.
+        { "en-JP", USCRIPT_KATAKANA_OR_HIRAGANA, "ja-jp" },
+
+        // Han scripts not in the first item.
+        { "en-US,ja-JP", USCRIPT_KATAKANA_OR_HIRAGANA, "ja-jp" },
+        { "en-US,en-JP", USCRIPT_KATAKANA_OR_HIRAGANA, "ja-jp" },
+
+        // Multiple Han scripts. The first one wins.
+        { "ja-JP,zh-CN", USCRIPT_KATAKANA_OR_HIRAGANA, "ja-jp" },
+        { "zh-TW,ja-JP", USCRIPT_TRADITIONAL_HAN, "zh-Hant" },
+    };
+
+    for (auto& test : tests) {
+        AcceptLanguagesResolver::updateFromAcceptLanguages(test.acceptLanguages);
+
+        EXPECT_EQ(test.script, AcceptLanguagesResolver::preferredHanScript())
+            << test.acceptLanguages;
+        EXPECT_STREQ(test.locale,
+            AcceptLanguagesResolver::preferredHanSkFontMgrLocale())
+            << test.acceptLanguages;
+    }
+}
+
+} // namespace blink