Add a comma delimited syntax parser and use it for Accept-CH

Source/platform/network/HTTPParsersTest.cpp

 // Copyright 2014 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 "config.h"
 #include "HTTPParsers.h"
 
 #include "wtf/MathExtras.h"
 #include "wtf/testing/WTFTestHelpers.h"
 #include "wtf/text/AtomicString.h"
@@ skipping 205 matching lines @@
     EXPECT_TRUE(failureReason.isEmpty());
     EXPECT_EQ("foo", name.string());
     EXPECT_EQ("bar", value.string());
 
     EXPECT_EQ(12u, parseHTTPHeader(data + 10, failureReason, name, value));
     EXPECT_TRUE(failureReason.isEmpty());
     EXPECT_EQ("hoge", name.string());
     EXPECT_EQ("fuga", value.string());
 }
 
+TEST(HTTPParsersTest, CommaDelimitedHeaderSet)
+{
+    CommaDelimitedHeaderSet set1;
+    CommaDelimitedHeaderSet set2;
+    parseCommaDelimitedHeader("dpr, rw, whatever", set1);
+    EXPECT_TRUE(set1.contains("dpr"));
+    EXPECT_TRUE(set1.contains("rw"));
+    EXPECT_TRUE(set1.contains("whatever"));
+    parseCommaDelimitedHeader("dprw\t     , fo\to", set2);
+    EXPECT_FALSE(set2.contains("dpr"));
+    EXPECT_FALSE(set2.contains("rw"));
+    EXPECT_FALSE(set2.contains("whatever"));
+    EXPECT_TRUE(set2.contains("dprw"));
+    EXPECT_FALSE(set2.contains("foo"));
+    EXPECT_TRUE(set2.contains("fo\to"));
+}
+
 } // namespace blink