Chameleon: Wait logner for display_client RPC server start

On Pit, the display_client RPC server takes ~30 seconds to start. The
current timeout, i.e. 30 seconds, is not enough. Increase it.

BUG=chromium:397287
TEST=Ran several Chameleon tests on Pit passed.

Change-Id: I7b91ca458335b7441797d43a18c7b263c1358fdd
Reviewed-on: https://chromium-review.googlesource.com/209843
Reviewed-by: Hung-ying Tyan <tyanh@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
1 file changed