[Android] memory_inspector: add resident memory accounting.

tools/memory_inspector/memory_inspector/core/stacktrace.py

Index: tools/memory_inspector/memory_inspector/core/stacktrace.py
diff --git a/tools/memory_inspector/memory_inspector/core/stacktrace.py b/tools/memory_inspector/memory_inspector/core/stacktrace.py
index 050c97628a878a5c2f7fc1621ab2b9382cacc28e..3f64e82ca24f97e67aa45b62f88ecd5ac87fe5e6 100644
--- a/tools/memory_inspector/memory_inspector/core/stacktrace.py
+++ b/tools/memory_inspector/memory_inspector/core/stacktrace.py
@@ -67,7 +67,7 @@ class Frame(object):
   @property
   def exec_file_name(self):
     """Returns the file name (stripped of the path) of the executable."""
-    if self.exec_file_rel_path is None:
+    if not self.exec_file_rel_path:
       return None
     return posixpath.basename(self.exec_file_rel_path.replace('\\', '/'))