[android] Instumentation tests determine whether to install test apk based on Md5Sum.

build/android/pylib/uiautomator/test_runner.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.
 
 """Class for running uiautomator tests on a single device."""
 
 from pylib.instrumentation import test_runner as instr_test_runner
 
 
 class TestRunner(instr_test_runner.TestRunner):
   """Responsible for running a series of tests connected to a single device."""
 
   def __init__(self, options, device, shard_index, test_pkg, ports_to_forward):
     """Create a new TestRunner.
 
     Args:
       options: An options object similar to the one in parent class plus:
         - package_name: Application package name under test.
     """
-    options.ensure_value('install_apk', True)
     options.ensure_value('wait_for_debugger', False)
     super(TestRunner, self).__init__(
         options, device, shard_index, test_pkg, ports_to_forward)
 
     self.package_name = options.package_name
 
   #override
   def InstallTestPackage(self):
       self.test_pkg.Install(self.adb)
 
   #override
   def PushDataDeps(self):
     pass
 
   #override
   def _RunTest(self, test, timeout):
     self.adb.ClearApplicationState(self.package_name)
     if 'Feature:FirstRunExperience' in self.test_pkg.GetTestAnnotations(test):
       self.flags.RemoveFlags(['--disable-fre'])
     else:
       self.flags.AddFlags(['--disable-fre'])
     return self.adb.RunUIAutomatorTest(
         test, self.test_pkg.GetPackageName(), timeout)