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

tools/relocation_packer/relocation_packer.gyp

Index: tools/relocation_packer/relocation_packer.gyp
diff --git a/tools/relocation_packer/relocation_packer.gyp b/tools/relocation_packer/relocation_packer.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..ca932a6e362fdf56f15e289eed813c7489e9b765
--- /dev/null
+++ b/tools/relocation_packer/relocation_packer.gyp
@@ -0,0 +1,65 @@
+# 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'pack_relocations',

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

nit - lib_relocation_packer ?

[simonb (inactive), 2014/06/04 16:40:35]

Done.

+      'toolsets': ['host'],
+      'type': 'static_library',
+      'dependencies': [
+        '../../third_party/elfutils/elfutils.gyp:libelf',
+      ],
+      'include_dirs': [
+        'src',

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

Is this needed?  Doesn't seem to be required in the unittest target.

[simonb (inactive), 2014/06/04 16:40:35]

Done.

+      ],
+      'sources': [
+        'src/relocation_packer_debug.cc',
+        'src/relocation_packer_elf_file.cc',
+        'src/relocation_packer_leb128.cc',
+        'src/relocation_packer_packer.cc',
+        'src/relocation_packer_rle.cc',

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

optional nit - maybe avoid the "relocation_packer_" prefix on every filename
since it's already in a directory called "relocation_packer".  Maybe also extend
"rle" to "run_length_encoder.cc".

[simonb (inactive), 2014/06/04 16:40:35]

Done.

+      ],
+    },
+    {
+      'target_name': 'relocation_packer',
+      'toolsets': ['host'],
+      'type': 'executable',
+      'dependencies': [
+        '../../third_party/elfutils/elfutils.gyp:libelf',
+        'pack_relocations',
+      ],
+      'include_dirs': [
+        'src',
+      ],
+      'sources': [
+        'src/relocation_packer_main.cc',
+      ],
+      'link_settings': {
+        'libraries': [
+          '-lelf',

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

Do you need this?  I though depending on the libelf target would do this for
you.

[simonb (inactive), 2014/06/04 16:40:35]

Done.

+        ],
+      },
+    },
+    {
+      'target_name': 'relocation_packer_unittests',
+      'toolsets': ['host'],
+      'type': 'executable',
+      'dependencies': [
+        '../../testing/gtest.gyp:gtest',
+        'pack_relocations',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [
+        'src/relocation_packer_elf_file_unittest.cc',
+        'src/relocation_packer_leb128_unittest.cc',
+        'src/relocation_packer_packer_unittest.cc',
+        'src/relocation_packer_rle_unittest.cc',
+        'src/run_all_unittests.cc',
+      ],
+    },
+  ],
+}