[Android WebAPK] Update org.chromium.webapk.new.splash test app to handle share intents

BUG=None

Change-Id: Ie52659e0042e608e045dd2ffb89ca370c964e6f3
Reviewed-on: https://chromium-review.googlesource.com/c/1298428
Reviewed-by: Xi Han <hanxi@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603155}
1 file changed