Refactoring unpack_lib_posix and obj_int_extract.

obj_int_extract.gypi

Index: obj_int_extract.gypi
diff --git a/obj_int_extract.gypi b/obj_int_extract.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..908d61f2cf695b8bd3063c46ca8d67a1f4fe1737
--- /dev/null
+++ b/obj_int_extract.gypi
@@ -0,0 +1,60 @@
+# Copyright 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.
+
+# Rule to extract integer values for each symbol from an object file.
+# The output file name is the input file name with extension replaced with
+# asm or h.
+# The following gyp variables must be set before including this gypi:
+#   output_format, the output format of integer value.
+#   output_dir, the full path where the output file should be created.
+#
+# For example:
+#
+# 'sources': ['a.o', 'b.o'],
+# 'variables': {
+#   'output_format': 'cheader',
+#   'output_dir': 'output',
+# },
+# 'includes': ['obj_int_extract.gypi'],
+#
+# This extracts the symbol from a.o and b.o, and outputs them to a.h and b.h
+# in output directory.
+{
+  'variables': {
+    'conditions': [
+      ['os_posix==1', {
+        'asm_obj_extension': 'o',
+      }],
+      ['OS=="win"', {
+        'asm_obj_extension': 'obj',
+      }],
+      ['output_format=="cheader"', {
+        'output_extension': 'h',
+      }, {
+        'output_extension': 'asm',
+      }],
+    ],
+  },
+  'rules': [
+    {
+      'rule_name': 'obj_int_extract',
+      'extension': '<(asm_obj_extension)',
+      'inputs': [
+        '<(PRODUCT_DIR)/libvpx_obj_int_extract',
+        'obj_int_extract.py',
+      ],
+      'outputs': [
+        '<(output_dir)/<(RULE_INPUT_ROOT).<(output_extension)',
+      ],
+      'action': [
+        '<(DEPTH)/third_party/libvpx/obj_int_extract.py',
+        '-e', '<(PRODUCT_DIR)/libvpx_obj_int_extract',
+        '-f', '<(output_format)',
+        '-b', '<(RULE_INPUT_PATH)',
+        '-o', '<(output_dir)/<(RULE_INPUT_ROOT).<(output_extension)',
+      ],
+      'message': 'Generate assembly offsets <(RULE_INPUT_PATH)',
+    },
+  ],
+}