Improve the launch time.

bug:5446617

Since there are two major blocking operations(openCamera and startPreview)
which are dependent and time-consuming, we have to take advantage of
this blocking intervals to do the layout inflation(setContentView) and indicator
initialization concurrently to reduce the launch time.

Change-Id: Ibbc3563ad3e8ccea409f61a5af9a8bdae0352579
1 file changed