Add a host tool to pack R_ARM_RELATIVE relocations in libchrome.<ver>.so.

tools/relocation_packer/src/relocation_packer_elf_file_unittest_relocs.cc

+// Copyright (c) 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.
+
+// Test data for packing/unpacking.  When compiled, creates a short vtable
+// that is represented as relative relocations in a shared library.
+//
+//   #!/bin/bash
+//   # Compile as an arm shared library.
+//     /usr/bin/arm-linux-gnueabi-g++ -shared -o \
+//       relocation_packer_elf_file_unittest_relocs.so \
+//       relocation_packer_elf_file_unittest_relocs.cc
+//
+//   # Add a new null .android.rel.dyn section, needed for packing.
+//     echo 'NULL' >/tmp/small
+//     /usr/bin/arm-linux-gnueabi-objcopy \
+//       --add-section .android.rel.dyn=/tmp/small \
+//       relocation_packer_elf_file_unittest_relocs.so
+//
+//   # Convert into C/C++ include file style for unit testing convenience.
+//     /usr/bin/xxd -i relocation_packer_elf_file_unittest_relocs.so \
+//       > relocation_packer_elf_file_unittest_relocs.so.h
+//
+//   # Cleanup.
+//     rm relocation_packer_elf_file_unittest_relocs.so
+
+struct Foo {

[rmcilroy, 2014/06/02 15:16:35]

How about putting this in a data directory (along with the so files) and call it
elf_file_unittest_sample.cc

+  virtual int f1(); virtual int f2();
+};
+struct Bar : Foo {
+  int f1() { return 1; };
+  int f2() { return 2; };
+};
+void Bas() {
+  Bar bar; bar.f1(); bar.f2();
+}