diff --git a/adb/device.py b/adb/device.py
index b6eaad6..a15675b 100644
--- a/adb/device.py
+++ b/adb/device.py
@@ -170,8 +170,12 @@
         out, _ = p.communicate()
         return self._parse_shell_output(out)
 
-    def install(self, filename):
-        return self._simple_call(['install', filename])
+    def install(self, filename, replace=False):
+        cmd = ['install']
+        if replace:
+            cmd.append('-r')
+        cmd.append(filename)
+        return self._simple_call(cmd)
 
     def push(self, local, remote):
         return self._simple_call(['push', local, remote])
diff --git a/init/perfboot.py b/init/perfboot.py
index 3d4940c..4c62e2a 100755
--- a/init/perfboot.py
+++ b/init/perfboot.py
@@ -40,6 +40,7 @@
 import argparse
 import atexit
 import cStringIO
+import glob
 import inspect
 import logging
 import math
@@ -408,9 +409,17 @@
                         'event tags are read. Every line contains one event '
                         'tag and the last event tag is used to detect that '
                         'the device has finished booting.')
+    parser.add_argument('--apk-dir', help='Specify the directory which contains '
+                        'APK files to be installed before measuring boot time.')
     return parser.parse_args()
 
 
+def install_apks(device, apk_dir):
+    for apk in glob.glob(os.path.join(apk_dir, '*.apk')):
+        print 'Installing: ' + apk
+        device.install(apk, replace=True)
+
+
 def main():
     args = parse_args()
     if args.verbose:
@@ -425,6 +434,9 @@
             device.get_prop('ro.build.version.incremental'))
     check_dm_verity_settings(device)
 
+    if args.apk_dir:
+        install_apks(device, args.apk_dir)
+
     record_list = []
     event_tags = filter_event_tags(read_event_tags(args.tags), device)
     init_perf(device, args.output, record_list, event_tags)