Handle back key to cancel text action mode in full-screen IME.
This CL is a follow up to I7998c8ee2162a0e01525a0cd66ec14fa505, which completely removed ExtractActionMode including back key handling in InputMethodService when full-screen mode is enabled. It turns out that back key events still need to be handled in InputMethodService when full-screen mode is enabled so that users can still cancel floating text action mode with back key. Bug: 22034992 Change-Id: I5f8db34f7425eef343d40d9820925ea6aaf9fccc
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