Open search ui on touch, and handle related scenarios.

- Add a touch listener to enter the search ui when the user touches
the search bar.
- Add a key listener to exit the search ui if the user closes the
keyboard while the text input is empty. SearchEditTextLayout was
added to facilitate this..
- Get rid of mFragmentsFrame, and control visibility of the
favorites view by adjusting the alpha of the lists framgent instead,
- Delete (hack) logic to change the background color.
- Enter the search ui whenever the dialpad is shown, and exit if it
is hidden and there is no query.
- Handle showing/hiding the actionbar depending on whether the
overlapping panel is displayed. This solution is a little hack, but
what seems to be a weird frameowrk interaction prevents the desired
solution of showing the action bar and then updating the hide offset.

Bug: 14900155
Change-Id: I4e06e4ed8eae49ef48317c99a556c51ff2a206a5

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