[DO NOT MERGE] Fix Accidently trigger A11y button long pressed

We used the original down location while injecting all down events.
It accidently increases the velocity in the beginning and cause
Launcher detect the gesture into unexpected state.

Test: manually
Bug: 162521649
Change-Id: I527f3e785ee1082f86ef1a60e57ccd825bdfeae9
1 file changed