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

third_party/instrumented_libraries/standard_instrumented_library_target.gypi

+# 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.
+
+# This file is meant to be included into a target for instrumented dynamic
+# libraries and describes standard build action for most of the libraries.
+
+{
+  'type': 'none',
+  'actions': [
+    {
+      'action_name': '<(_target_name)',
+      'inputs': [
+        'download_build_install.sh',
+      ],
+      'outputs': [
+        '<(PRODUCT_DIR)/instrumented_libraries/asan/<(_target_name).txt',
+      ],
+      'action': ['./download_build_install.sh', '-i', '<(PRODUCT_DIR)', '-l', '<(_target_name)', '-m', '<(INTERMEDIATE_DIR)', '-s', 'asan'],
+    },
+  ],
+}