Add a fuzzer for the feature policy string parser.

third_party/WebKit/Source/platform/feature_policy/FeaturePolicyFuzzer.cpp

Index: third_party/WebKit/Source/platform/feature_policy/FeaturePolicyFuzzer.cpp
diff --git a/third_party/WebKit/Source/platform/json/JSONParserFuzzer.cpp b/third_party/WebKit/Source/platform/feature_policy/FeaturePolicyFuzzer.cpp
similarity index 50%
copy from third_party/WebKit/Source/platform/json/JSONParserFuzzer.cpp
copy to third_party/WebKit/Source/platform/feature_policy/FeaturePolicyFuzzer.cpp
index 467c0ece0afe1cf3e4cfbdb4c96b3c3c4470c25b..d6863f52fba665f389a35fa3f039e86372eeb389 100644
--- a/third_party/WebKit/Source/platform/json/JSONParserFuzzer.cpp
+++ b/third_party/WebKit/Source/platform/feature_policy/FeaturePolicyFuzzer.cpp
@@ -2,16 +2,24 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "platform/json/JSONParser.h"
+#include "platform/feature_policy/FeaturePolicy.h"
 
-#include "platform/json/JSONValues.h"
+#include "platform/heap/Handle.h"
 #include "platform/testing/BlinkFuzzerTestSupport.h"
+#include "platform/weborigin/SecurityOrigin.h"
+#include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
+#include <memory>
 #include <stddef.h>
 #include <stdint.h>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  blink::parseJSON(WTF::String(data, size));
+  WTF::Vector<WTF::String> messages;
+  RefPtr<blink::SecurityOrigin> origin =
+      blink::SecurityOrigin::createFromString("https://example.com/");
+  std::unique_ptr<blink::FeaturePolicy> policy =
+      blink::FeaturePolicy::createFromParentPolicy(nullptr, origin);
+  policy->setHeaderPolicy(WTF::String(data, size), messages);
   return 0;
 }