Add desktopui_AppShellFlashstation autotest.

Add a simple test for mappy_flashstation.

BUG=chromium:395192
TEST=ran it and confirmed that it passes when app_shell is
     running and fails when it isn't

Change-Id: I2f30ee1afa5b5a3be3bf5983b8f69b718fb58335
Reviewed-on: https://chromium-review.googlesource.com/214186
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Commit-Queue: Daniel Erat <derat@chromium.org>
Tested-by: Daniel Erat <derat@chromium.org>
2 files changed