Use DisplayContext to replace default context

When detecting gesturs, the threshold is based on the display metrics.
To get correct display metrics, we replace default context with displayContext.

Bug: 136425762
Test: atest TouchExploreTest
Test: atest MagnificationGestureHandlerTest

Change-Id: I2d6c5a0ef00966d9164e117fc65dac8131f7a175
1 file changed