[Android] Prepare build/android/ for catapult+devil.

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
index ced24b2bb9e0863e0c8e9c60967a13e004534133..89905928ec8b270c2ccf45799dd6c6069ca61e57 100755
--- a/build/android/host_heartbeat.py
+++ b/build/android/host_heartbeat.py
@@ -12,11 +12,14 @@ This heart beat lets the devices know that they are connected to a host.
 import sys
 import time
 
+import devil_chromium
 from devil.android import device_utils
 
 PULSE_PERIOD = 20
 
 def main():
+  devil_chromium.Initialize()
+
   while True:
     try:
       devices = device_utils.DeviceUtils.HealthyDevices(blacklist=None)