Add a fuzzer for the feature policy string parser.

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index 5df17d1daf68fcd638022bf7cca2c8e81abf460d..cbc7f29ad8e86b75a60966c96fc6e8a22c768d8c 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1952,6 +1952,19 @@ fuzzer_test("blink_json_parser_fuzzer") {
   dict = "//testing/libfuzzer/fuzzers/dicts/json.dict"
 }
 
+# Fuzzer for blink::FeaturePolicy.
+fuzzer_test("feature_policy_fuzzer") {
+  sources = [
+    "feature_policy/FeaturePolicyFuzzer.cpp",
+  ]
+  deps = [
+    ":blink_fuzzer_test_support",
+    ":platform",
+  ]
+  dict = "//testing/libfuzzer/fuzzers/dicts/feature_policy.dict"
+  seed_corpus = "//testing/libfuzzer/fuzzers/feature_policy_corpus"
+}
+
 # NOTE: These are legacy unit tests and tests that require a Platform
 # object. Do not add more unless the test requires a Platform object.
 # These tests are a part of the webkit_unit_tests binary.