[libfuzzer] store custom options in .GN build target instead of a separate file.

testing/libfuzzer/tests/fuzzer_launcher_test.cc

 // 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.
 
 // Fuzzer launcher script tests.
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 31 matching lines @@
   std::string launcher_path =
     exe_path.DirName().Append("check_fuzzer_config.py").value();
 
   std::string output;
   base::CommandLine cmd({{launcher_path, "test_config_only.options"}});
   bool success = base::GetAppOutputAndError(cmd, &output);
   EXPECT_TRUE(success);
   std::vector<std::string> fuzzer_args = base::SplitString(
       output, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 
-  EXPECT_EQ(3UL, fuzzer_args.size());
+  EXPECT_EQ(2UL, fuzzer_args.size());
 
-  EXPECT_EQ(fuzzer_args[0], "max_len=random(1337, 31337)");
-  EXPECT_EQ(fuzzer_args[1], "timeout=666");
-  EXPECT_EQ(fuzzer_args[2], "use_traces=1");
+  EXPECT_EQ(fuzzer_args[0], "some_test_option=test_value");
+  EXPECT_EQ(fuzzer_args[1], "max_len=1024");
 }
 
 
 TEST(FuzzerConfigTest, ConfigAndDict) {
   // Test of .options file for fuzzer with options file and dictionary.
   base::FilePath exe_path;
   PathService::Get(base::FILE_EXE, &exe_path);
   std::string launcher_path =
     exe_path.DirName().Append("check_fuzzer_config.py").value();
 
   std::string output;
   base::CommandLine cmd({{launcher_path, "test_config_and_dict.options"}});
   bool success = base::GetAppOutputAndError(cmd, &output);
   EXPECT_TRUE(success);
   std::vector<std::string> fuzzer_args = base::SplitString(
       output, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 
   EXPECT_EQ(4UL, fuzzer_args.size());
 
-  EXPECT_EQ(fuzzer_args[0], "max_len=random(1337, 31337)");
-  EXPECT_EQ(fuzzer_args[1], "timeout=666");
-  EXPECT_EQ(fuzzer_args[2], "use_traces=1");
-  EXPECT_EQ(fuzzer_args[3], "dict=test_config_and_dict.dict");
+  EXPECT_EQ(fuzzer_args[0], "dict=test_config_and_dict.dict");
+  EXPECT_EQ(fuzzer_args[1], "max_len=random(1337, 31337)");
+  EXPECT_EQ(fuzzer_args[2], "timeout=666");
+  EXPECT_EQ(fuzzer_args[3], "use_traces=1");
 }
 
 
 TEST(FuzzerConfigTest, DictSubdir) {
   // Test of auto-generated .options file for fuzzer with dict in sub-directory.
   base::FilePath exe_path;
   PathService::Get(base::FILE_EXE, &exe_path);
   std::string launcher_path =
     exe_path.DirName().Append("check_fuzzer_config.py").value();
 
   std::string output;
   base::CommandLine cmd({{launcher_path, "test_dict_from_subdir.options"}});
   bool success = base::GetAppOutputAndError(cmd, &output);
   EXPECT_TRUE(success);
   std::vector<std::string> fuzzer_args = base::SplitString(
       output, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 
   EXPECT_EQ(1UL, fuzzer_args.size());
 
   EXPECT_EQ(fuzzer_args[0], "dict=test_dict_from_subdir.dict");
 }