Install app, get result and show appropriate dialog to user

Kick off the install process and wait for the result. Show appropriate dialogs at each stage: installing, install success, install failure.

Bug: 182205982
Test: builds successfully
Test: No CTS Tests. Flag to use new app is turned off by default

Change-Id: I172a4a46e0b4190a6352c433c4cf09251bbb89db