Change the firmware screen delay to 2 seconds.

When the DEV_SCREEN_SHORT_DELAY flag on GBB is enabled, the developer screen
will directly boot into the disk image after 2 seconds. So the original
delay 10 seconds is too long. Change it to 2 seconds, the time that the
developer screen is surely showed, and that the timeout is not happened.

BUG=chromium-os:19710
TEST=run_remote_tests.sh --remote=$REMOTE_IP -a "xml_config=$OVERLAY_XML \
        servo_vid=0x18d1 servo_pid=0x5001" firmware_DevMode

Change-Id: I9c0d687e6f7f9e7360e3f646aad5a3abf0608e92
Reviewed-on: https://gerrit.chromium.org/gerrit/14140
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
diff --git a/server/cros/faftsequence.py b/server/cros/faftsequence.py
index 4e28550..8fbcc46 100644
--- a/server/cros/faftsequence.py
+++ b/server/cros/faftsequence.py
@@ -83,7 +83,7 @@
     OTHER_ROOTFS_MAP = {'a':'5', 'b':'3', '2':'5', '4':'3', '3':'5', '5':'3'}
 
     # Delay timing
-    FIRMWARE_SCREEN_DELAY = 10
+    FIRMWARE_SCREEN_DELAY = 2
     TEXT_SCREEN_DELAY = 20
     USB_PLUG_DELAY = 10
     SYNC_DELAY = 5