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

third_party/crazy_linker/crazy_linker/src/crazy_linker_search_path_list.h

Index: third_party/crazy_linker/crazy_linker/src/crazy_linker_search_path_list.h
diff --git a/third_party/crazy_linker/crazy_linker/src/crazy_linker_search_path_list.h b/third_party/crazy_linker/crazy_linker/src/crazy_linker_search_path_list.h
new file mode 100644
index 0000000000000000000000000000000000000000..dd3fd911133c8341fc6b48671b85b60f91f45fec
--- /dev/null
+++ b/third_party/crazy_linker/crazy_linker/src/crazy_linker_search_path_list.h
@@ -0,0 +1,49 @@
+// 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_SEARCH_PATH_LIST_H
+#define CRAZY_LINKER_SEARCH_PATH_LIST_H
+
+#include <string.h>
+
+#include "crazy_linker_util.h"  // for String
+
+namespace crazy {
+
+// A simple class to model a list of search paths, and perform
+// file system probing with it.
+class SearchPathList {
+ public:
+  SearchPathList() : list_(), env_list_(), full_path_() {}
+
+  // Reset the list, i.e. make it empty.
+  void Reset();
+
+  // Reset the list from an environment variable value.
+  void ResetFromEnv(const char* var_name);
+
+  // Add one or more paths to the list.
+  // |path_list| contains a list of paths separated by columns.
+  // |path_list_end| points after the list's last character.
+  void AddPaths(const char* path_list, const char* path_list_end);
+
+  // Convenience function that takes a 0-terminated string.
+  void AddPaths(const char* path_list) {
+    AddPaths(path_list, path_list + ::strlen(path_list));
+  }
+
+  // Try to find a file named |file_name| by probing the file system
+  // with every item in the list as a suffix. On success, returns the
+  // full path string, or NULL on failure.
+  const char* FindFile(const char* file_name);
+
+ private:
+  String list_;
+  String env_list_;
+  String full_path_;
+};
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_SEARCH_PATH_LIST_H