Asynchronously inflate the bouncer.

As we are lazily inflating the bouncer every time we show it, we can get
huge performance gains from AsyncInflater. From the class documentation
"This is intended for parts of the UI that are created lazily or in
response to user interactions. This allows the UI thread to continue to
be responsive & animate while the relatively heavy inflate is being
performed." it seems that this is the perfect use case.

I've added the AsyncInflater in a dagger module for testing purposes. I
also moved the handler constructrion in KeyguardMessageArea to its
corresponding view controller to conform to the AsynInflater
requirements.

Interestingly this also fixes b/265384692 as it seemed like the bouncer
was being inflated before the onclicklisteners were added.

Fixes: 269522372
Fixes: 265384692
Test: Test for talk back to ensure that it announces the text view.
Test: open scrimmed and non scrimmed bouncer.
Test: Pin, Password, pattern, simpin, simpuk
Test: modified unit tests.

Change-Id: Ic65af22da9f6822e5137aae3cfee03a6e819ab94