Allow the default generic font family settings to find the first available font

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

Index: third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp b/third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp
index 5eeaa67825c3a4ce757ea3384c856d2bd03f4be7..8f2dc92fdd4cc426ba4019d967d3142cba85a34f 100644
--- a/third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp
+++ b/third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp
@@ -35,4 +35,24 @@ TEST(FontCache, getLastResortFallbackFont) {
   EXPECT_TRUE(fontData);
 }
 
+TEST(FontCache, firstAvailableOrFirst) {
+  EXPECT_TRUE(FontCache::firstAvailableOrFirst("").isEmpty());
+  EXPECT_TRUE(FontCache::firstAvailableOrFirst(String()).isEmpty());
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("Arial"));
+  EXPECT_EQ("not exist", FontCache::firstAvailableOrFirst("not exist"));
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("Arial, not exist"));
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst("not exist, Arial"));
+  EXPECT_EQ("Arial",
+            FontCache::firstAvailableOrFirst("not exist, Arial, not exist"));
+
+  EXPECT_EQ("not exist",
+            FontCache::firstAvailableOrFirst("not exist, not exist 2"));
+
+  EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst(", not exist, Arial"));
+  EXPECT_EQ("not exist",
+            FontCache::firstAvailableOrFirst(", not exist, not exist"));
+}
+
 }  // namespace blink