Phil Weaver 77287ab7d1 Block a11y-changing key events from a11y services
If the volume keys are being pressed to enable or disable
an accessibility service, the key events should not be
dispatched to accessibility services.

Bug: 62653966
Test: A11y CTS and unit tests. Adding a set of unit tests for
the expanded KeyboardInterceptor. Also verified that the
accessibility shortcut now works as designed with TalkBack.

Change-Id: Iaea58a5bfe6748d4b9a033f5b957e78298881c40
2017-07-06 13:32:56 -07:00
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