GN: Side-load dex files as well as native code in incremental installs

build/android/pylib/utils/time_profile.py

 # 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.
 
 import logging
 import time
 
 
 class TimeProfile(object):
   """Class for simple profiling of action, with logging of cost."""
 
-  def __init__(self, description):
+  def __init__(self, description='operation'):
     self._starttime = None
+    self._endtime = None
     self._description = description
     self.Start()
 
   def Start(self):
     self._starttime = time.time()
+    self._endtime = None
 
-  def Stop(self):
-    """Stop profiling and dump a log."""
-    if self._starttime:
-      stoptime = time.time()
-      logging.info('%fsec to perform %s',
-                   stoptime - self._starttime, self._description)
-      self._starttime = None
+  def GetDelta(self):
+    """Returns the rounded delta.
+
+    Also stops the timer if Stop() has not already been called.
+    """
+    if self._endtime is None:
+      self.Stop(log=False)
+    delta = self._endtime - self._starttime
+    delta = round(delta, 2) if delta < 10 else round(delta, 1)
+    return delta
+
+  def LogResult(self):
+    """Logs the result."""
+    logging.info('%s seconds to perform %s', self.GetDelta(), self._description)
+
+  def Stop(self, log=True):
+    """Stop profiling.
+
+    Args:
+      log: Log the delta (defaults to true).
+    """
+    self._endtime = time.time()
+    if log:
+      self.LogResult()