Adds a flag "use_instrumented_libraries" and corresponding target with 2 simple libs

third_party/instrumented_libraries/instrumented_libraries.gyp

+# 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'instrumented_libraries',
+      'type': 'none',
+      'variables': {
+         'prune_self_dependency': 1,
+      },
+      'dependencies': [
+        'libpng12-0',
+        'libxau6',
+      ],
+      'actions': [
+        {
+          'action_name': 'fix_rpaths',
+          'inputs': [
+            'fix_rpaths.sh',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/instrumented_libraries/asan/rpaths.fixed.txt',
+          ],
+          'action': ['./fix_rpaths.sh', '<(PRODUCT_DIR)/instrumented_libraries/asan'],
+        },
+      ],
+    },
+    {
+      'target_name': 'libpng12-0',
+      'dependencies=': [],
+      'includes': ['standard_instrumented_library_target.gypi'],
+    },
+    {
+      'target_name': 'libxau6',
+      'dependencies=': [],
+      'includes': ['standard_instrumented_library_target.gypi'],
+    },
+  ],
+}