Add 'path' member in policies.json to specify policy file path

tools/deep_memory_profiler/lib/policy.py

 # Copyright 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.
 
 import json
 import logging
 import os
 import re
 
 
@@ skipping 235 matching lines @@
                region[1]['vma']['writable'] +
                region[1]['vma']['executable'] +
                region[1]['vma']['private'])) and
           (not rule.sharedwith or
            not pageframe or sharedwith in rule.sharedwith)):
         return rule.name
 
     assert False
 
   @staticmethod
-  def load(filename, filetype):
+  def load(path, filename, filetype):
     """Loads a policy file of |filename| in a |format|.
 
     Args:
         filename: A filename to be loaded.
         filetype: A string to specify a type of the file.  Only 'json' is
             supported for now.
 
     Returns:
         A loaded Policy object.
     """
-    with open(os.path.join(BASE_PATH, filename)) as policy_f:
+    if not path:
+      path = BASE_PATH
+    elif path[0] == '.':
+      path = os.path.join(BASE_PATH, path)
+    with open(os.path.join(path, filename)) as policy_f:
       return Policy.parse(policy_f, filetype)
 
   @staticmethod
   def parse(policy_f, filetype):
     """Parses a policy file content in a |format|.
 
     Args:
         policy_f: An IO object to be loaded.
         filetype: A string to specify a type of the file.  Only 'json' is
             supported for now.
@@ skipping 117 matching lines @@
     with open(POLICIES_JSON_PATH, mode='r') as policies_f:
       default_policy_directory = json.load(policies_f)
     return default_policy_directory
 
   @staticmethod
   def _load_policies(directory):
     LOGGER.info('Loading policy files.')
     policies = {}
     for label in directory:
       LOGGER.info('  %s: %s' % (label, directory[label]['file']))
-      loaded = Policy.load(directory[label]['file'], directory[label]['format'])
+      path = None
+      if 'path' in directory[label]:
+        path = directory[label]['path']
+      loaded = Policy.load(path, directory[label]['file'], directory[label]['format'])
       if loaded:
         policies[label] = loaded
     return PolicySet(policies)