Update cached kiosk app crx from usb stick.

chrome/test/data/chromeos/app_mode/external_update/external_update.json

Index: chrome/test/data/chromeos/app_mode/external_update/external_update.json
diff --git a/chrome/test/data/chromeos/app_mode/external_update/external_update.json b/chrome/test/data/chromeos/app_mode/external_update/external_update.json
new file mode 100644
index 0000000000000000000000000000000000000000..96644b1fc82d3eb996953d09848b196ef1b688f8
--- /dev/null
+++ b/chrome/test/data/chromeos/app_mode/external_update/external_update.json
@@ -0,0 +1,9 @@
+// Dictionary of external kiosk extensions to be updated.  Each entry maps
+// the extension's id to its crx's path (relative to this file) and the version
+// of the extension contained in the crx.
+{
+  "ajoggoflpgplnnjkjamcmbepjdjdnpdp" : {
+    "external_crx": "ajoggoflpgplnnjkjamcmbepjdjdnpdp-2.0.0.crx",
+    "external_version": "2.0.0"
+  }
+}