1. Touch exploration start and end events are generated
by the sytstem to provide additional information for
accessibility services. Since such events do not come
from any particular window they whould not change the
id of the window that currently allows exploring its
content.
2. Touch exploration start and end events were lealing the
touch explorer class wich is private.
bug:5026258
Change-Id: Icaf3e2bd9566716f2afb876cf8e0d50813b0c76e
63c04eeb00