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

third_party/crazy_linker/crazy_linker/src/crazy_linker_line_reader.h

Index: third_party/crazy_linker/crazy_linker/src/crazy_linker_line_reader.h
diff --git a/third_party/crazy_linker/crazy_linker/src/crazy_linker_line_reader.h b/third_party/crazy_linker/crazy_linker/src/crazy_linker_line_reader.h
new file mode 100644
index 0000000000000000000000000000000000000000..1f71d56f1a24178ed2db2e4741ed452874f44070
--- /dev/null
+++ b/third_party/crazy_linker/crazy_linker/src/crazy_linker_line_reader.h
@@ -0,0 +1,60 @@
+// 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_LINE_READER_H
+#define CRAZY_LINKER_LINE_READER_H
+
+#include <string.h>
+
+#include "crazy_linker_system.h"
+
+namespace crazy {
+
+// A class used to read text files line-by-line.
+// Usage:
+//    LineReader reader("/path/to/file");
+//    while (reader.GetNextLine()) {
+//       const char* line = reader.line();
+//       size_t line_len = reader.length();
+//       ... line is not necessarily zero-terminated.
+//    }
+
+class LineReader {
+ public:
+  LineReader();
+  explicit LineReader(const char* path);
+  ~LineReader();
+
+  // Open a new file for testing. Doesn't fail. If there was an error
+  // opening the file, GetNextLine() will simply return false.
+  void Open(const char* file_path);
+
+  // Grab next line. Returns true on success, or false otherwise.
+  bool GetNextLine();
+
+  // Return the start of the current line, this is _not_ zero-terminated
+  // and always contains a final newline (\n).
+  // Only call this after a successful GetNextLine().
+  const char* line() const;
+
+  // Return the line length, this includes the final \n.
+  // Only call this after a successful GetNextLine().
+  size_t length() const;
+
+ private:
+  void Reset();
+
+  FileDescriptor fd_;
+  bool eof_;
+  size_t line_start_;
+  size_t line_len_;
+  size_t buff_size_;
+  size_t buff_capacity_;
+  char* buff_;
+  char buff0_[128];
+};
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_LINE_READER_H