Add default options for ThreadSanitizer on Linux. Enable deadlock detection by default.

base/debug/sanitizer_options.cc

 // Copyright 2014 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.
 //
 // This file contains the default options for various compiler-based dynamic
 // tools.
 
 #include "build/build_config.h"
 
 // Functions returning default options are declared weak in the tools' runtime
@@ skipping 52 matching lines @@
 __attribute__((no_sanitize_address))
 __attribute__((visibility("default")))
 // The function isn't referenced from the executable itself. Make sure it isn't
 // stripped by the linker.
 __attribute__((used))
 const char *__asan_default_options() {
   return kAsanDefaultOptions;
 }
 #endif  // OS_LINUX || OS_MACOSX
 #endif  // ADDRESS_SANITIZER
+
+#if defined(THREAD_SANITIZER) && defined(OS_LINUX)
+// Default options for ThreadSanitizer in various configurations:
+//   detect_deadlocks=1 - enable deadlock (lock inversion) detection.
+//   second_deadlock_stack=1 - more verbose deadlock reports.
+const char kTsanDefaultOptions[] = "detect_deadlocks=1 second_deadlock_stack=1";
+
+extern "C"
+__attribute__((no_sanitize_thread))
+__attribute__((visibility("default")))
+// The function isn't referenced from the executable itself. Make sure it isn't
+// stripped by the linker.
+__attribute__((used))
+const char *__tsan_default_options() {
+  return kTsanDefaultOptions;
+}
+
+#endif  // THREAD_SANITIZER && OS_LINUX