Provision Android devices after the 'device_status_check' step.

build/android/host_heartbeat.py

Index: build/android/host_heartbeat.py
diff --git a/build/android/host_heartbeat.py b/build/android/host_heartbeat.py
new file mode 100755
index 0000000000000000000000000000000000000000..7f04bd221a5c22f09d0d393644e910affc6af479
--- /dev/null
+++ b/build/android/host_heartbeat.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+#
+# 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.
+
+"""Sends a heart beat pulse to the currently online Android devices.
+This heart beat lets the devices know that they are connected to a host.
+"""
+
+import sys
+import time
+
+from pylib import android_commands
+
+PULSE_PERIOD = 20
+
+def main():
+  while True:
+    devices = android_commands.GetAttachedDevices()
+    for device in devices:
+      android_cmd = android_commands.AndroidCommands(device)
+      android_cmd.RunShellCommand('rm -f /sdcard/host_heartbeat')
+    time.sleep(PULSE_PERIOD)
+
+
+if __name__ == '__main__':
+  sys.exit(main())