[libfuzzer] support multiple seed_corpus directories.

testing/libfuzzer/tests/BUILD.gn

 # Copyright 2015 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.
 #
 # Fuzzing Infrastructure Tests
 
 import("//testing/test.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 test("libfuzzer_tests") {
   sources = [
     "fuzzer_launcher_test.cc",
   ]
   deps = [
     ":test_config_and_dict",
+    ":test_config_and_seed_corpus",
+    ":test_config_and_seed_corpuses",
     ":test_config_only",
     ":test_dict_from_subdir",
     ":test_dict_only",
     "//base",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/gtest:gtest_main",
   ]
   data_deps = [
     ":check_fuzzer_config",
+    ":check_seed_corpus_archive",
   ]
 }
 
 fuzzer_test("test_dict_only") {
   sources = [
     "../fuzzers/empty_fuzzer.cc",
   ]
   dict = "test.dict"
 }
 
@@ skipping 12 matching lines @@
     "../fuzzers/empty_fuzzer.cc",
   ]
   dict = "test.dict"
   libfuzzer_options = [
     "max_len=random(1337, 31337)",
     "timeout   =   666",
     "use_traces=1",
   ]
 }
 
+fuzzer_test("test_config_and_seed_corpus") {
+  sources = [
+    "../fuzzers/empty_fuzzer.cc",
+  ]
+  seed_corpus = "test_corpus"
+  libfuzzer_options = [
+    "some_test_option=test_value",
+    "max_len=1024",
+  ]
+}
+
+fuzzer_test("test_config_and_seed_corpuses") {
+  sources = [
+    "../fuzzers/empty_fuzzer.cc",
+  ]
+  seed_corpuses = [
+    "test_corpus",
+    "test_corpus_2",
+  ]
+  libfuzzer_options = [
+    "some_test_option=another_test_value",
+    "max_len=1337",
+  ]
+}
+
 fuzzer_test("test_dict_from_subdir") {
   sources = [
     "../fuzzers/empty_fuzzer.cc",
   ]
   dict = "dicts_subdir/test_subdir.dict"
 }
 
 copy("check_fuzzer_config") {
   sources = [
     "check_fuzzer_config.py",
   ]
   outputs = [
     "$root_build_dir/check_fuzzer_config.py",
   ]
 }
+
+copy("check_seed_corpus_archive") {
+  sources = [
+    "check_seed_corpus_archive.py",
+  ]
+  outputs = [
+    "$root_build_dir/check_seed_corpus_archive.py",
+  ]
+}