This patch adds a new third-party library that implements an ELF dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_globals.h

Index: third_party/crazy_linker/crazy_linker/src/crazy_linker_globals.h
diff --git a/third_party/crazy_linker/crazy_linker/src/crazy_linker_globals.h b/third_party/crazy_linker/crazy_linker/src/crazy_linker_globals.h
new file mode 100644
index 0000000000000000000000000000000000000000..43dfe8738fa03e54f5604ef7d03823d72ff84446
--- /dev/null
+++ b/third_party/crazy_linker/crazy_linker/src/crazy_linker_globals.h
@@ -0,0 +1,67 @@
+// Copyright (c) 2013 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.
+
+#ifndef CRAZY_LINKER_GLOBALS_H
+#define CRAZY_LINKER_GLOBALS_H
+
+#include <pthread.h>
+
+#include "crazy_linker_library_list.h"
+#include "crazy_linker_rdebug.h"
+#include "crazy_linker_search_path_list.h"
+#include "crazy_linker_util.h"
+
+// All crazy linker globals are declared in this header.
+
+namespace crazy {
+
+class Globals {
+ public:
+  Globals();
+  ~Globals();
+
+  void Lock() {
+    pthread_mutex_lock(&lock_);
+  }
+
+  void Unlock() {
+    pthread_mutex_unlock(&lock_);
+  }
+
+  static Globals* Get();
+
+  static LibraryList* GetLibraries() {
+    return &Get()->libraries_;
+  }
+
+  static SearchPathList* GetSearchPaths() {
+    return &Get()->search_paths_;
+  }
+
+  static RDebug* GetRDebug() {
+    return &Get()->rdebug_;
+  }
+
+private:
+  pthread_mutex_t lock_;
+  LibraryList libraries_;
+  SearchPathList search_paths_;
+  RDebug rdebug_;
+};
+
+// Helper class to access the globals with scoped locking.
+class ScopedGlobalLock {
+ public:
+  ScopedGlobalLock() {
+    Globals::Get()->Lock();
+  }
+
+  ~ScopedGlobalLock() {
+    Globals::Get()->Unlock();
+  }
+};
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_GLOBALS_H