Alan Viverette 57525a7054 Refactor MagnificationController out to its own class
First step in moving ownership to AccessibilityServiceManager so that we
can implement the magnification control APIs.

The magnification Region and the current/sent MagnificationSpecs are now
private to the controller, and all access is handled through accessor
methods. Comments have been added to all public accessor methods.

Bug: 22718911
Change-Id: Ia50ee93513785585aac5424543fc1d730b84bd90
2015-10-30 15:24:51 -04:00
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