[android] Switch test scripts to use last modified time instead of md5sum when checking dependencie…

build/android/pylib/gtest/test_package_apk.py

 # Copyright (c) 2012 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 os
 import shlex
 import sys
 import tempfile
@@ skipping 104 matching lines @@
       self._ClearFifo()
       self._StartActivity()
     finally:
       self.tool.CleanUpEnvironment()
     logfile = android_commands.NewLineNormalizer(sys.stdout)
     return self._WatchTestOutput(self._WatchFifo(timeout=10, logfile=logfile))
 
   def _NeedsInstall(self):
     installed_apk_path = self.adb.GetApplicationPath(self._apk_package_name)
     if installed_apk_path:
-      return not self.adb.CheckMd5Sum(
+      return not self.adb.CheckTimesModified(
           self.test_suite_full, installed_apk_path, ignore_paths=True)
     else:
       return True
 
   def StripAndCopyExecutable(self):
     self.tool.CopyFiles()
     if self._NeedsInstall():
       # Always uninstall the previous one (by activity name); we don't
       # know what was embedded in it.
       self.adb.ManagedInstall(self.test_suite_full, False,
                               package_name=self._apk_package_name)
 
   def _GetTestSuiteBaseName(self):
     """Returns the  base name of the test suite."""
     # APK test suite names end with '-debug.apk'
     return os.path.basename(self.test_suite).rsplit('-debug', 1)[0]