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

tools/deep_memory_profiler/lib/policy.py

Index: tools/deep_memory_profiler/lib/policy.py
diff --git a/tools/deep_memory_profiler/lib/policy.py b/tools/deep_memory_profiler/lib/policy.py
index 2a41bb25106740ffa1ca695a5b50ff81bea5163b..1de24d91a9f5e0dbd451b90cb194aff09c5a2090 100644
--- a/tools/deep_memory_profiler/lib/policy.py
+++ b/tools/deep_memory_profiler/lib/policy.py
@@ -253,7 +253,7 @@ class Policy(object):
     assert False
 
   @staticmethod
-  def load(filename, filetype):
+  def load(path, filename, filetype):
     """Loads a policy file of |filename| in a |format|.
 
     Args:
@@ -264,7 +264,11 @@ class Policy(object):
     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
@@ -402,7 +406,10 @@ class PolicySet(object):
     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)