Fix: Retry unlock command when it times out

The command passed to the Android emulator's shell to unlock the device can
  be killed by ADB if the device takes too long to accept the command.
  To fix, we retry the command until it succeeds.

jtd-android-init.py

@@ -157,11 +157,23 @@ def AndroidBrowserIsCaptured():
   # the screen by pressing the Menu button.
   subprocess.call([ADB_PATH, "shell", "input", "keyevent", "3"])
 
+
+#
 # Unlock the Android emulator's screen
-# Unfortunately, there is no way to detect whether the screen is locked from
-# the command line. In any event, we unlock the screen by sending the
-# keyevent corresponding to the Menu button once the emulator is initialized.
-subprocess.call([ADB_PATH, "wait-for-device", "shell", "input", "keyevent", "82"])
+#
+
+
+# There is no way to detect whether the screen is locked from the command line,
+# but if it is, we can unlock it by sending the keyevent corresponding to the
+# Menu button once the emulator is initialized. This command may timeout if
+# the emulator takes too long to load, so we retry until it succeeds.
+print("\nUnlocking Android device...")
+while 1:
+  unlockProc = subprocess.Popen([ADB_PATH, "wait-for-device", "shell", "input", "keyevent", "82"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+  result = unlockProc.communicate()[0].decode("utf-8")
+  if result.find("Killed") == -1:
+    print("Device unlocked\n")
+    break
 
 
 #