[libfuzzer] in-vcs corpus support.

third_party/boringssl/BUILD.gn

Index: third_party/boringssl/BUILD.gn
diff --git a/third_party/boringssl/BUILD.gn b/third_party/boringssl/BUILD.gn
index 2ac6ec3829761299ade72eb275b0d75d6aefcf26..080464e3fc76a495c9a0f257db57533ad4b2f5b5 100644
--- a/third_party/boringssl/BUILD.gn
+++ b/third_party/boringssl/BUILD.gn
@@ -127,6 +127,7 @@ fuzzer_test("boringssl_d2i_x509_fuzzer") {
   deps = [
     ":boringssl",
   ]
+  seed_corpus = "src/fuzz/cert_corpus"
 }
 
 fuzzer_test("boringssl_client_bio_write_fuzzer") {
@@ -136,6 +137,7 @@ fuzzer_test("boringssl_client_bio_write_fuzzer") {
   deps = [
     ":boringssl",
   ]
+  seed_corpus = "src/fuzz/client_corpus"
 }
 
 fuzzer_test("boringssl_d2i_autoprivatekey_fuzzer") {
@@ -145,6 +147,7 @@ fuzzer_test("boringssl_d2i_autoprivatekey_fuzzer") {
   deps = [
     ":boringssl",
   ]
+  seed_corpus = "src/fuzz/privkey_corpus"
 }
 
 fuzzer_test("boringssl_server_bio_write_fuzzer") {
@@ -154,4 +157,5 @@ fuzzer_test("boringssl_server_bio_write_fuzzer") {
   deps = [
     ":boringssl",
   ]
+  seed_corpus = "src/fuzz/server_corpus"
 }