Prevent non-system IME from becoming device admin
Currently selected IME can inject KeyEvent on DeviceAdminAdd screen to activate itself as device admin and cause various DoS attacks. This CL ensures KeyEvent on "Activate" button can only come from system apps. Fix: 280793427 Test: atest DeviceAdminActivationTest Change-Id: I6470d1684d707f4b1e86f8b456be0b4e0af5f188
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