Add Android-backend to the memory_inspector (prerequisites).

tools/memory_inspector/tests/mock_adb/adb

+#!/usr/bin/python
+# 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.
+
+"""Client side of the mock adb (i.e. the one called instead of the actual adb).
+
+This file is meant to be put in front of the PATH during integration tests, in
+order to route all the adb calls here and serve them using a pre-configured
+dictionary (epxected commands -> planned responses).
+mock_adb.py is the counterpart of this file, and is meant to be used in the
+unittests for configuring the behavior (i.e. the dictionary) of this script.
+"""
+
+import json
+import optparse
+import os
+import sys
+
+
+def main(argv):
+  # Load the dictionary of expected_cmd -> planned_response from the json file
+  # which mock_adb.py creates.
+  with open(os.environ['MOCK_ADB_CFG']) as f:
+    responses = json.load(f)
+
+  # Swallow the irrelevant adb extra arguments (e.g., device id).
+  parser = optparse.OptionParser()
+  parser.add_option('-s')
+  options, args = parser.parse_args(argv[1:])
+  adb_args = ' '.join(args)
+
+  response = ''
+  for (cmd, planned_response) in responses.iteritems():
+    if adb_args.startswith(cmd):
+      response = planned_response
+  print response
+
+if __name__ == '__main__':
+  main(sys.argv)