Add fuzzer infra to blink and fuzz CSS parser

third_party/WebKit/Source/core/css/StyleSheetContentsFuzzer.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 "core/css/StyleSheetContents.h"
+
+#include "platform/testing/BlinkFuzzerTestSupport.h"
+#include "wtf/text/WTFString.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    blink::CSSParserContext context(blink::HTMLStandardMode, nullptr);
+    blink::StyleSheetContents* styleSheet = blink::StyleSheetContents::create(context);
+    styleSheet->parseString(String::fromUTF8WithLatin1Fallback(reinterpret_cast<const char*>(data), size));
+    return 0;
+}
+
+extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv)
+{
+    blink::InitializeBlinkFuzzTest(argc, argv);
+    return 0;
+}