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Installing an ephemeral app bypasses download of the CRX from the
webstore and thus also bypasses post-install UI. This patch ensures
that post-install UI is shown, such as showing the app launcher with
the app highlighted.

BUG=394997
TEST=See bug

Review URL: https://codereview.chromium.org/407483002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285859 0039d316-1c4b-4281-b951-d872f2087c98